Question
A certain sum of money yields Rs. 9,930 as compound
interest for 3 years at 10% per annum. The sum is (in rupees).Solution
Let the principal be Rs. x, Now, CI = P [ ( 1 + R/100 )įµ - 1 ] ā 9930 = x [ ( 1 + 10/100 Ā )Ā³ - 1 ] ā 9930 = x ( 1331/1,000 - 1 ) ā 9930 = x ( (1331 - 1000)/1000 ) = 331/1000 x x = (9930 Ć 1,000)/331 = Rs. 30,000
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