A certain sum amounts to four times the principal within a period of 2 years. The rate of simple interest per annum is

If the principal is double in ten years, then the rate of simple interest per annum is

The ratio of the principal and the amount (principal along with interest) in 1 year is 8:9 , the rate of simple interest per annum is __________.

A certain money amounts 9440Rs on simple interest in 3 years. If the rate of simple interest be 25% increased per annum, then the money will become 9800Rs after same period of time. Find the principal and the rate of interest in percent per annum.

The simple interest accrued on an amount of Rs. 40000 for 2 years is 1/8 of the principal. What is the rate of simple interest per annum?

Fill in the blanks If the ratio between principal and amount in 1 year is 8:9, then the rate of simple interest per annum is_____.

If the simple interest on a certain sum of money for 2 years is one-fifth of the principal, then find the rate of interest per annum.

With a given rate of simple interest, the ratio of principal and amount for a certain period of time is 4 : 5. After 3 years, with the same rate of interest, the ratio of the principal and amount becomes 5: 7. The rate of interest per annum is

If the simple interset on a certain sum of money afte 6 (1)/(4) years is (3)/(8) of the principal, then find the rate of interest per annum.