A certain sum becomes doubled in 5 years. Find the rate of interest.

(a) A certain sum becomes double in 3 years, find the rate of interest. (b) Find the simple interest on Rs. 8900 for 2(1)/(2) years at the rate of 18% p.a.

A certain sum of money becomes 3 times of itself in 50years. Find the Rate of interest.

A sum of money, lent out at simple interest, doubles itself in 8 years. Find : (i) the rate of interest. (ii) In how many years will the sum become triple (three times) of itself at the same rate percent ?

A certain sum becomes Rs. 2400 in 10 years at the rate of 2% per annum under simple interest. Find the sum.

A certain sum of money becomes amoung at the certain rate of interest of CI to Rs. 7350 in 2 years & to Rs. 8575 in 3 years. Find the sum of money & rate of interest.

A sum amounts to Rs. 5600 in 4 years and Rs. 6400 in 6 years at a certain rate of simple interest. Find the rate of interest per annum and the sum.