31.
The compound interest (compounding annually) on a certain sum at the rate of 8 percent per annum for two years is Rs. 6656. What would be the simple interest on the same sum at the same rate of interest for two years?

33.
If the cost of a mobile phone is Rs. 25,000, available at Rs. 5,000 down payment followed by 3 equal annual instalments (each instalment is to be paid at the end of each year) at the rate 25% p.a. compound interest, then find the value of each instalment (rounded off to two decimal places):

34.
If the difference between the compound interest and simple interest on a certain sum of money for three years at 10% p.a. is Rs. 558. Then the sum is:

35.
A sum of Rs. 15,000 is lent at 16% p.a. compound interest. What is the difference between the compound interest for the second year and the third year?

37.
A sum of money becomes Rs. 11,880 after 4 years and Rs. 17,820 after 6 years on compound interest, if the interest is compounded annually. What is the half of the sum (in Rs.)?

38.
Rs. 4,000 is given at 5% per annum for one year and interest is compounded half yearly. Rs. 2,000 is given at 40% per annum compounded quarterly for 1 year. The total interest received is nearest to:

40.
A sum of money after a period of 2 years becomes Rs. 34,560, and it becomes Rs. 41,472 after a period of three years, being compounded at 'R' rate of interest. What is the value of R?

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