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If the cost price of 10 articles is equal to the selling price of 9 articles, the gain or loss percent is
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11 1 % profit 9 -
7 6 % profit 17 -
11 1 % loss 9 -
1 12 % loss 13
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Correct Option: A
Let C.P. of each article be $ 1
Then, C.P. of 9 articles = $ 9
S.P. of 9 articles = $ 10
Profit = S.P. of 9 articles - C.P. of 9 articles = 10 - 9 = $ 1
| Required profit percent = | × 100 | C.P. of 9 articles |
| Required profit percent = | × 100 = 11 | % | 9 | 9 |
Second method to solve this question :
Here, p = 10, q = 9
| Profit % = |  | p - q |  | × 100 | |
| q |
| Profit % = | | 10 - 9 | | × 100 | |
| 9 |
| Profit % = | × 100 | 9 |
| = 11 | % | 9 |
