10. John borrowed some money at the rate of 7% per annum for the first 3yr, at the rate of 9% per annum
for the next 5yr and at the rate of 12% per annum for the period beyond Syr. If he pays a total interest of Rs 5100
at the end of 11yr how much money did he borrow?
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which class you read I don't no answer
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