Answers

2014-02-26T11:19:45+05:30
11 books for 100 rupees
1
book for 100/11 = 9.09 rupees
10 books for 9.09 x10 = 90.9 rupees

so my profit {(110-90.9)/90.9} x 100 = 21%
0
2014-02-26T12:41:19+05:30