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Business profits are often calculated on the selling price, and it is useful to have a ready method of comparing profit on selling price.
Rule — Give the percentage profit on cost, to find the percentage profit on selling price. Express the percentage as a vulgar fraction and add the numerator to the denominator, e.g.
| Percentage profit on cost Fraction |
First Fraction |
Second on sale |
Percentage Profit |
| 20% |
1 / 5 |
1 / 6 |
162 / 3% |
| 25% |
1 / 4 |
1 / 5 |
20% |
| 331 / 3% |
1 / 3 |
1 / 4 |
25% |
| 40% |
2 / 5 |
2 / 7 |
28.57% |
| 50% |
1 / 2 |
1 / 3 |
331 / 3%
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