Question

The simple interest on a sum of money is 4/9 of the principal and the number of years is equal to the rate per cent annum. What is the rate per cent per annum

Answer 1

Answer:

s.i. = 4/9 of P

R = t

then,

s.i. = P*R*T/100

4/9 * P = P*R*R/100. (Since t=R)

4/9 * 100 = R*R

R =

$\sqrt{400 \div 3}$

R = 20/3= 6.3%