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A certain sum of money is invested at...

A certain sum of money is invested at an interest rate of 5% per annum and a second sum, twice as large as the first, is invested at 5.5% p.a. The total amount of interest earned from the two investments together is Rs 1000 per year and the interest is withdrawn every year. The second sum invested is (a) Rs 6250   (b) Rs 10500   (c) Rs 12500   (d) Rs 15000

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