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Question
The simple interest on a sum of money will be Tk. 600 after 10 years . If the principal is trebled after 5 years , what will be the total interest at the end of the tenth year?
Tk. 600
Tk. 1200
Tk. 900
Tk. 1500
ANSWER : 2
Descrption
<p>ধরি, মূলধন = x টাকা</p> <p> x টাকায় 10 বছরের সুদ = 600টাকা</p> <p>x টাকায় 1 বছরের সুদ = 600/10 টাকা</p> <p>x টাকায় 5 বছরের সুদ = 600×5/10 = 300 টাকা</p> <p>যেহেতু, 5 বছরের পর মূলধন 3 গুন হয়। সুতরাং নতুন মূলধন = 3x</p> <p>এখন, x টাকার 5 বছরের মুনাফা = 300 টাকা</p> <p>1 টাকায় 5 বছরের মুনাফা = 300/x টাকা</p> <p>3x টাকায় 5 বছরের মুনাফা = 300 × 3x /x টাকা = 900 টাকা</p> <p>মোট মুনাফা = 900 + 300 = 1200 টাকা </p>
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