Question

At what rate per cent per annum simple interest will a sum treble itself in 16 years?

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Answer 1

Explanation:

Let, the SUM = Rs X and RATE = r%.

TIME (t) = 16 years.

Since, X tripled in 16 years,

INTEREST (I) = Rs (3X - X) = Rs 2X.

Now,

I = (S × t × r) / 100

2X = (X × 16 × r) / 100

r = 50/4

Rate = 12.5%

Hope this helps mate ☺️.

Answer 2

LET THE SUM BE X

AMOUNT = 3x

SI=3x-x=2x

T= 16yr

P=x SI = 2X T 16 YEARS

R 12.5 %