At aimple interest a sum become `6/5` of itsself in`2./2` years. The rate of interest per annum is

At aimple interest a sum become 6/5 of itsself in 2(1)/(2) years. The rate of interest per annum is

At simple interest s sum become 49/40 itself in 2.1/2 years. The rate of interest per annum is

At r% per annum a sum become 2 times after 20 years. The rate of interest per annum is :

The simple interest on a sum for 5 years is one fourth of the sum. The rate of interest per annum is

If a sum of money compounded annually becomes 1.44 times of itself in 2 years, then the rate of interest per annum is

A sum of Rs. 1600/- gives a simple interest of Rs. 252/in 2 years and 3 months. The rate of interest per annum is: