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SSC GD 2021 PYQ — Question 51

SSC GD Constable (English) - 16th November 2021 Shift 1 • Quantitative Aptitude • Q51

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A certain sum amounts to ₹13200 after 4 years and to ₹16400 after 8 years at the same rate percent p.a. Add to simple interest. The simple interest (in ₹) on the same sum at 10% p.a. for 315\frac 1 5 years will be:

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Correct answer: B

Explanation

The correct answer is option 2 i.e. 3200

A certain sum amounts to Rs. 13200 after 4 years and to Rs. 16400 after 8 years

In simple interest, the interest is always constant if the rate and sum are the same

So, Interest for 4 years = 16400 - 13200

⇒ Rs 3200

So, for the 1st 4 years, the interest will be Rs. 3200

So, Sum = 13200 - 3200

⇒ Rs 10000

Now,

Sum = (10000 × 10 × 16)/(100 × 5)

= 100 × 2 × 16

= Rs 3200