SSC CHSL 11 Jan 2017 Shift 2 Paper

The interest earned on 7600 from Jan to July will be $7600\times 20\times \frac{1}{100}$ (Since rate of interest is 5 % per 6 months)
= $76\times 20=1520$
Hence, 7600 will amount to 9120. He adds another 7600 to this. So the net amount becomes $9120+7600=16,720.$
Now interest earned on this amount in a period of 6 months will be $16720\times 20\times \frac{1}{100}=3344$
So the final amount will be $16720+3344=20064$
Total money he deposited = $7600+7600=15200$
Hence, amount earned via interest = $20064-15200=\mathit{R}\mathit{s}.4864$