A sum of Rs 1600 lent at simple interest at 12.5% per annum will become double in:

 a) 3 years
 b) 7 ¼ years
 c) 8 years
 d) 9 ¼ years
SSC CHSL-2015

8 years.
Solution
SI = PNR/100
SI= 1600
P =1600, N = 12.5%
N = (SI x 100)/ PR
==> N = 8
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