(10) In how many years a sum becomes 4
times of itself at the rate of 12%p.a.?
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Answer:
let us assume the sum as 100rs
intrest of 12% on 100 is 12rs
4time the sum of 100 is 400
so 12rs intrest for 25years (12×25=300) in simple intest.
100 becomes 400 in 25years at 12%p.a SI.
prrof: A= P+I
SI = 100×25×12÷100
so SI = 300
A= 300+100 = 400
so answer is 25years
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