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Question
compound interest on a certain sum for 2 years at 10% per annum is tk.420. what wouls be the simple interest at the same rate and for the same time ?
TK,100
TK.200
TK.300
TK.400
ANSWER : 4
Descrption
<p>ধরি, sum ( মূলধন) = p</p> <p>p ( 1 + r)<sup>n</sup> - p = 420</p> <p>p { ( 1 + 10/100)<sup>2</sup> - 1 } = 420</p> <p>p ( 121/100 - 1) = 420</p> <p>21p = 420 × 100</p> <p>p = 2000</p> <p>সরল মুনাফা I = 2000 × 2 × 10/100 = 400. </p>
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