Rs 1000 is invested at 5% per annum simple interest. If the interest is added to the principal after every 10 years, the amount will become Rs 2000 after (a) 15 years (b) `16 2/3` years (c) 18 years (d) `20` years

A sum of Rs 1000 is invested at 8 % simple interest per annum .Find the interest at the end of 30 years .

If Rs 1000 is invested for two years at simple interest at the rate of 12.5% per annum, then what is the amount ?

An amount invested at simple interest gives Rs 800 interest at 16% in 2 years. What is the principal (in Rs)?

Simple interest on Rs500 for 4 years at 6.25% per annum is equal to the simple interest on Rs 400 at 5% per annum for a certain period of time.The period of time is (a) 4 years (b) 5 years (c) 6(1)/(4) years (d) 8(2)/(3) years

Rs. 1000 is deposited at 10 per cent simple interest. Check if the interest amount at the end of every year is in A.P. If this is A.P. then find amount of the interest after 20 years. For this complete the following activity.

A sum of Rs 2,000 invested at 9.25% simple interest per annum for 4 years will yield an interest of