F3 Maths--Percentages(5分!!!!)
2008-08-23 6:26 pm
The selling price of a dozen of eggs is equal to the cost price of 15 eggs.Find the percentage profit.
回答 (1)
2008-08-23 8:36 pm
✔ 最佳答案
Let $s be the selling price of 1 egg.
Let $c be the cost of 1 egg.
12s = 15c
s = (15/12)c
s = 1.25c
Percentage profit = [(s-c)/c]x100%
Percentage profit = [(1.25c-c)/c]x100%
Percentage profit = 25%
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