খাদ্য ২০ সপ্তাহ চলে = ২০০ জন লোকের 

খাদ্য ১ সপ্তাহ চলে $২০০\times ২০$ জন লোকের 

খাদ্য ৮ সপ্তাহ চলে $\frac{২০০\times ২০}{৮}=৫০০$ জন লোকের 

এক্ষেত্রে প্রয়োজনীয় সূত্রটি হলোঃ A এর Income B এর চেয়ে r%বেশি হবে। 

B এর Income A এর Income এর চেয়ে $\left(\frac{r}{100+r}\times 100\right)$ কম হবে।

তাই শরীফের বেতন কম হবে = $\left(\frac{২৫}{১০০+২৫}\times ১০০\right)\%=\left(\frac{২৫}{১২৫}\times ১০০\right)\%=২০\%$ ans.

ঐ ব্রাঞ্চের ৬০% কর্মী পুরুষ হলে মহিলা কর্মীর সংখ্যা = ১০০ - ৬০ = ৪০% 

পুরুষ কর্মী বনভোজনে যায় = ৬০% এর ৭০%= ৪২ জন 
মহিলা কর্মী বনভোজনে যায় = ৪০% এর ১০% = ৩৬ জন 

বনভোজনে কর্মী অংশগ্রহণ করে = ৪২ + ৩৬ = ৭৮ জন। 

ans. ৭৮% জন কর্মী বনভোজনে অংশগ্রহণ করে।

৩০% ফল বিক্রির পর অবশিষ্ট থাকে = ১০০-৩০=৭০% 

প্রশ্নমতে, ফলের ৭০% = ৬৩০ টি 

ফলের ১০০% = $\frac{৬৩০\times ১০০}{৭০}=৯০০$ টি । ans. 

Kamal doesn't know how to swim.

Now China is the second largest economy in the world.

Default loan is a big problem for financial institutions.

You had better take loan from bank. . 

The Banking Sector has for centuries now formed one of the pillars of economic prosperity.

Detail role of commercial banks in economic development is given below:

Trade Development: The commercial banks provide capital, technical assistance and other facilities to businessmen according to their need, which leads to development in trade.

 Agriculture Development: Commercial banks finance the most important sector of the developing economy i.e. agriculture. Short, medium and long-term loans are provided for the purchase of seeds and fertilizer, installation of tube wells, construction of warehouses, purchase of tractor and thresher etc. 

Industrial Development: The countries, which concentrated on industrial sector made rapid. economic development. South Korea, Malaysia, Taiwan, Hong Kong and Indonesia have recently developed their industrial sector with the help of commercial banks.

Capital Formation: Commercial banks help in increasing the rate of capital formation in a country. Capital formation means increase in number of production units, technology, plant and machinery. They finance the projects responsible for increasing the rate of capital formation.

Development of Foreign Trade: Commercial banks help the traders of two different countries to
undertake business: Letter of credit is issued by the importer's to the exporters to ensure the payment. The banks also arrange foreign exchange.

Transfer of Money: Commercial banks provide the facility of transferring funds from one place to another which leads to the growth of trade.

 More Production: A good banking system ensures more production in all sectors of the economy. It increases the production capabilities of the economy by strengthening capital structure and  division of labor.

Development of Transport: The commercial banks financed the transport sector. It has reduced  unemployment on one hand and increased the transport facility on the other hand. Remote areas are linked to main markets through developed transport system. 

Safe Custody: The business concerns and individuals can make themselves tension free by depositing their surplus money in banks. The banks also provide them the facility of lockers to keep their precious articles and necessary documents safe .

Increase in Saving: Commercial banks persuade the people to save more. Different saving schemes with attractive interest rates are introduced for this purpose. Number of bank branches is opened in urban and rural areas. 

Construction of Houses: Commercial banks provide credit facilities to their customers purchase or construction of houses 

Assistance to Government: By providing funds to government for development program commercial banks share the government for economic stability.

 Increase in Employment: A country's economic prosperity depends on the development of commerce industry, agriculture, trum port and communication etc. These sectors are financed by commercial banks and employment opportunities are increasing Saving in Metallic Reserve Che ques and drafts ete works like money. In this way the precious metals to make coins reduces and metallic reserve of the country can be unitized in important matters

 Credit Creation: Commercial banks are called the factories of credit They advance much more what the collect from people in the form of deposits Through the process of credit creation, commercial banks provide finance to all sectors of the economy this taking them more developed than before

Proper use of Money: People deposit their saving in the banks, so the scattered money become huge amount in the way, which can be used for different projects in a proper way. 

Financial Advice's: Commercial banks also give useful financial advice to promote the business their customers, besides credit facilities. 

Increase in Investment: Commercial banks mobilize savings of the people. They make them at to the farmers, traders and industrialists for the development of agriculture, trade and industry. 

Success of Monetary Policy: Under the supervision of central bank, all scheduled coma banks make effort for the success and objectives of monetary policy. This joined effuse commercial banks makes the economic development possible.

Use of Modern Technology: The use of modern technology in less developed countries is possible in the presence of developed commercial banking as it can be the main source of their fay These funds are utilized for the import of modern technology from developed countries. 

Export Promotion Cells: In order to boost the exports of the country, the banks have establish export promotion cells for the information and guidance to the exporters,

Economic Prosperity: Economic prosperity of a country depends on number of factors incline the
development of commercial banking A sound banking system promotes the economic san the people by providing them short, medium and long-term loans.

Training Center: Commercial banks established many trading centers for their employees modernize the banking system of a country. In this way the banking experts enhance their abilities and contribute towards the development of country. 

I have read a lot of books. They appear to me in different ways. But the book that. I like best is 
"Letters from a father to his daughter". The late Jawaharlal is the author of this book. This is a series of letters written by Nehru to his nine years old daughter Indira. This is a very interesting n instructive book. This is a book of lasting value Jawaharlal. So, this book has been many time approved as a Rapid Reader for the school and the college students.

 The book deals with the birth and development of the animal world. This book deals with the and development of the human civilization. They are written in right order. There are thirty chap in all in this little book. There are fourteen pictures in this book, these pictures are of some fishes, extinci animals, tells of the New Stone age and the old stone age, houses built in a la picture writing, the Great wall of China and the ruins in Egypt. The author has given very go pieces of advice too, here and there in this book. Hence, this is a very useful book for the student is written in English. 

This book appeals to me to a great extent, because the language is very simple and easy understand. The matter is presented in a very clear and lucid manner. The description is lively. not complicated. The complex ideas have been simplified. This is a book of history, geography natural science and philosophy. It is full of general knowledge about our past. So, this book appeals me very much.