On a deposit of Rs.6000, Sham received at the end of 1 year Rs.6900. What was his interest and rate of interest?

P= Rs. 6000, A= Rs. 6660 and the time period is 1 year. Find the interest and the rate of interest per annum.

Sneha opened a cumulative time deposit account with a bank. She deposits Rs. 500 per month for (1)(1)/(4) years. If she receives Rs.300 as interest, find the rate of interest per annum.

The simple interest accrued of an amount of Rs. 22,500 at the end of four years is Rs. 10,800. what would be the compound interest accrued on the same amount at the same rate at the end of two years ?

The total amount of interest received on two deposits of Rs. 5,000 for 4 years and Rs 4,000 for 5 years, made at the same smiple rate of interest per annum was Rs. 2,400. Find the rate of interest per annum.