Question

O.
LUE
9. At what rate per cent per annum simple interest will a sum treble itself in 16 years?
Hint. Let the sum be * x. Then, amount = * 3x. S.I. = (3x - x) = 2x.)
Lan vaalaned at 6% per annum simple interest amounts to 7 4130 in 3 years.​

Answer 1

Answer:

rate of simple profit (r)=?

time (n)= 16 yrs

here, the amount is trebled after 16 yrs.

so, if,

principal(p) = X,

total amount(A) = 3x

simple profit (I) = (3x-x) = 2x

we know

$i = prn \\ > r = \frac{i}{pn} = \frac{2x}{x \times 16} = \frac{1}{8} = \frac{1}{8} \times 100\% = 12.5\%$