Simple and Compound Interest Problems with Solutions

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Before going to the simple interest and compound interest problems, you should revise the simple and compound interest formulas. After revising the formulas you will understand the following examples.
Example 1:If the difference between Simple Interest and Compound Interest on a certain sum of money in 2 years at 20 % p.a. is Rs. 800, then find the sum.
Example 2:The compound interest on a certain sum of money for 2 years is Rs. 52 and the simple interest for the same time at the same rate is Rs. 50. Find the rate %.
Example 3:The difference between Compound Interest and Simple Interest on a certain sum of money at 10 % per annum for 3 years is Rs. 930. Find the principal if it is known that the interest is compounded annually.
Example 4:The population of a town has a constant growth of 4% p.a. If its present population is 62,500, what will be its population after two years?
Example 5:The cost of a new washing machine is Rs. 12000. Its value depreciates every year at the rate of 10%. What will be its value after three years?
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