Question

The simple interest on a certain sum for 2.5 years at 12% p. a., is rupees 40 less than the simple interest on the same sum for 3.5 years at 10% p. a., . find the sum ​

Answer 1

Let the sum be x.

=> (x * 10 * 7/100 * 2) - (x * 12 * 5/100 * 2) = 40

=> (70x/200) - (60x/200) = 40

=> 10x/200 = 40

=> 10x = 8000

=> x = 800.

Hence, the sum is 800.

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