SSC CHSL Model Paper 18

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Question : 63 of 100

Marks: +1, -0

The simple interest on a certain sum for 8 months at 4% per annum is 129 less than the simple interest on the same sum for 15 months at 5% per annum. The sum is?

3600
1800
5200
1200

Solution:

Let the sum be 100x

SI =\PRT/100

Then

{75x}/12-{32x}/12=129

43/12x=129

x = 36

The sum

=100x = 100 × 36 = \Rs.3600.

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