Goods were bought for Rs. 600 and sold the same for Rs. 688.50 at a credit of 9 months and thus gaining 2% The rate of interest per annum is:

A.
16 2 %
3
B.
14 1 %
2
C.
13 1 %
3
D. 15%

• 2 % gain means selling price is 612
  but Rs. 688.50 at a credit of 9 months
  so difference is 688.5-612 = 76.5
  so he gives simple interest on 612 for 9 mnths and gate 76.5 interest
  so interest is 50/3 %
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