Question
A milk seller assures that he
sells at cost price but delivers 900 ml of a mixture that contains 180 ml of water. What percentage profit does he make, knowing that water costs nothing?Solution
ATQ, Let the cost price of 1 ml of milk be Rs. '100x'. Quantity of milk in the final mixture = 900 - 180 = 720 ml So, the cost price of the mixture = 720 X 100x = Rs. '72000x' Selling price of the mixture = 900 X 100x = Rs. '90,000x' So, profit percentage = [(90000 - 72000) / 72000] X 100 = (18000 / 72000) Ă— 100 = 25%
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