Question

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at what rate percent per anum will the simple interest on a sum of money be 2/5 of the amount in 10 years? ​

Answer 1

Answer:

Let the sum be P and interest rate = r

Then interest after 10 years = (2/5)P

Now put values inthe formula

(2/5)P = P×10× r/100

r = 2×100(10×5) = 4%