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The simple interest on a certain sum of money for 2 1/2 years at 12% per annum is TK. 40 less than the simple interest on the same interest on the same sum for 3 1/2 years at 10% per annum. Find the sum.

Correct Answer: TK. 800
Hints : The simple interest on a certain sum of money for 2.5 year's at 12% per annum is TK.40 less than the simple interest on the same sum for 3.5 years at 10% per annum The simple interest on a certain sum of money for 2.5 years at 12% per aannum = pnr = 12 × 2.5 × x the simple interest on the same sum for 3.5 years at 10% per annum = pnr = 1 × 3.5 × x So, 12 × 2.5 × x + 40 = 1 × 3.5 × x 0.3x + 40 = 0.35 x o.35 x - 0.3x = 40 o.o5x = 40 x = 800

The simple interest on a certain sum of money at 4 percent per annum for 4 years is Tk. 87.5 more than interest on the same sum for 3 years at 5 percent per annum . Find the sum of money.

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