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The simple interest on a certain sum for...

The simple interest on a certain sum for 8 years at 12 per cent per annum is Rs. 3120 more than the simple interest on the same sum for 5 years at 14 per cent per annum. Find the sum.

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NCERT EXEMPLAR-COMPARING QUANTITIES-EXERCISE
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  11. The simple interest on a certain sum for 8 years at 12 per cent per an...

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  12. The simple interest on a certain sum for 2.5 years at 12 per cent per ...

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