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Question

Ranbir borrows Rs. 20,000 at 12% per annum compound interest. If he repays Rs. 8400 at the end of the first year and Rs. 9680 at the end of the second year, find the amount of loan outstanding at the beginning of the third year.

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Solution

Given that Ranbir borrows Rs.20000 at 12% compound interest.
For First year
Interest I=20000×1×12100=Rs.2400
Thus amount after one year =Rs.20000+Rs.2400=Rs.22400
Money repaid =Rs.8400
Balance =Rs.22400Rs.8400=Rs.14000
For Second year
Interest I=14000×1×12100=Rs.1680
Thus amount after one year =Rs.14000+Rs.1680=Rs.15680
Ranbir paid Rs.9680 at the end of second year.
Loan outstanding at the beginning of the third year =Rs.15680Rs.9680=Rs.6000

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