2015 · Q15
A milkman claims to sell milk at its cost price only, but he is making a profit of 20% since he has mixed some amount of water in the milk. What is the percentage of milk in the mixture?
Elementary MathematicsProfit and Loss
- A80\%
- B250/3\%
- C75\%
- D200/3\%
Explanation
If the mixture contains fraction f of milk, selling 1 litre at the price of pure milk at cost f gives profit (1−f)/f = 20% = 1/5, so 1 − f = f/5 and f = 5/6 = 250/3% ≈ 83.33% (option B).