A sum of money lent at compound interest at the rate of 10% per annum is paid back in three equal instalments of Rs 3,993. Find the sum?

Sum = Instalment {10/11 + (10/11)^{2}+ (10/11)^{3 }} Sum = 3,993 {10/11 + 100/121 + 1000/1331} = 3993 {(1210 + 1100 + 1000)/1331} = 3993 {3310/1331} = Rs 9930

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- If a sum when placed at compound interest grows to Rs.6,400 in 2 yrs and to Rs. 8,000 in 3 yrs, find the rate percent p.a.
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- The difference between compound and simple interest on a sum of money for 2 years at 25% per annum is Rs. 880. The sum is:
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- At what rate percent per annum will Rs. 75,000 yields a compound interest of Rs. 6,120 in 6 months if the interest is being compounded quarterly? Calculate the simple interest at the same rate of interest for 18 months.
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- A took a loan of Rs.5680 at simple interest of 30% p.a. and invested the same money in a scheme at simple interest of 40% p.a. Find the profit earned by A at the end of 2 years.

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