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 ?

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 ? Correct Answer TK.400

ধরি, sum ( মূলধন) = p p ( 1 + r)n - p = 420 p { ( 1 + 10/100)2 - 1 } = 420 p ( 121/100 - 1) = 420 21p = 420 × 100 p = 2000 সরল মুনাফা I = 2000 × 2 × 10/100 = 400.
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