A milkman sold milk at two different rates depending on how much water he added to them. One of the types in which he added no water, he sold it for ₹ 101 per kilogram. The one in which he added water he sold it for ₹ 81 per kilogram. He sold 4 kilograms of pure milk and 9 kilograms in which water was added. Find his net monthly income. [4 MARKS]

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Solution

Concept: 1 Mark
Steps: 2 Marks
Answer: 1 Mark

Given that :
The cost of pure milk = ₹ 101 per kilogram
The cost of milk in which water was added= ₹ 81 per kilogram
Amount of pure milk he sold = 4 kilograms
Amount of impure milk he sold = 9 kilograms
$∴$ His net income = 101 $\times$ 4 + 81 $\times$ 9 = (100+1) $\times$ 4 + (80 + 1) $\times$ (10-1)
= 400 + 4 + 800 - 80 + 10- 1 = ₹ 1133

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