The cost price of y articles is equal to selling price of z articles. If y : z = 5 : 4, what is the profit percentage?
A.20%
B.25%✓ Correct
C.30%
D.40%
Explanation
Let CP per article = 1. CP of y articles = y = SP of z articles, so SP per article = y/z = 5/4. Profit per article = 5/4 - 1 = 1/4. Profit% = (1/4)/1 × 100 = 25%.
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