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Shri Vile Parle Kelavani Mandal s C.N.M. School & N.D. Parekh Pre-Primary School LAST REVISION WORKSHEET Class : X (MUST KNOW QUESTIONS) 2016-17 MATHEMATICS 1. COMPOUND INTEREST (1) Find the amount and the compound interest on Rs 10,000 at 8 per cent per annum and in 2 years. (Ans: - A = Rs 11,664; I = Rs 1664). (2) Find the amount and the compound interest on Rs 10,000 at 8 per cent per annum in 1 year; Interest being compounded half-yearly. (Ans: - A = 10,816; I = Rs 816). (3) A man borrows Rs 8,000 at 10% compound interest if he repays Rs 1, 500 at the end of the first and Rs 3,200 at the end of second year, find the amount of loan outstanding at the beginning of the third year (Ans:- Rs 4,830). (4) Calculate the compound interest accrued on Rs 16,000 in 3 years, when the rates of interest for successive years are 10% , 12% and 15% respectively. (Ans:- C.I. = Rs 6,668 80). (5) A man borrows Rs 8,000 at 10% compound interest payable every six months . He repays Rs 2,500 at the end of every six months . Calculate the third payment he has to make at the end of 18 months in order to clear the entire loan. (Ans:- Rs 3,879 75). (6) On a certain sum of money , invested at the rate of 5% per annum compounded annually , the difference between the interest of the first year and the interest of the third year is Rs 61 50 . Find the sum. (Ans:- Sum = Rs 12,000). (7) Mrs. Kapoor invested Rs 6,000 every year at the beginning of the year , at 10% per annum compound interest . Calculate the amount of her total savings : (i) upto the end of the second year . (ii) at the beginning of the third year. (Ans:- Amount of 2nd year = Rs 13,860 ; Amount of 3rd year = Rs 19,860). (8) During every financial year , the value of a machine depreciates by 10% . Find the original value (cost) of a machine which depreciates by Rs 2,250 during the second year. (Ans:- Original cost = Rs 25,000).
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