A certain amount of money earning simple interest becomes 7/5th of the initial amount in 4 years. What is the interest rate?

A 4%

B 6%

C 8%

D 10%

E None of these

Solution

Correct Answer: Option D

মনেকরি
আসল P = 100 টাকা
মুনফা- আসল A = 100 এর 7/5 = 140 টাকা
মুনাফা I = 140 - 100 = 40 টাকা
সময় n = 4 বছর
মুনাফার হার r = ?

আমরাজানি
I = Pnr
r = I/Pn
  = (40 × 100)/(100 × 4)
  = 10%

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