At what rate of interest per annum the simple interest on a certain sum becomes 2 5 times of?

A sum of money becomes 8 / 5 of itself in 5 years at a certain rate of simple interest .find the rate of interest.

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At what rate of interest per annum, the simple interest on a certain sum becomes 2/5 times of amount in 10 years at simple interest?

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Related At what rate of interest per annum, the simple interest on a certain sum becomes 2/5 times of amount in 10 years at simple interest?

Let the principal be:x

Rate be:R

Time given is 10 yrs

Interest becomes 2x/5;

Substituting,

I = (P*R*T)/100;

2x/5= (x*10*R)/100;

Solving:

You get R=4

Ans. Rate= 4 %pa

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