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 Rs 101 per kilogram. The one in which he added water he sold it for Rs 81. 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=Rs 101 kilogram
The cost of milk in which water was added= Rs 81 per kilogram
Amount of pure milk he sold= 4 kilograms
Amount of impure milk = 9 kilograms
$∴$ His net income= 101 $\times$ 4 + 81 $\times$ 9 = (100+1) $\times$ 4 + (80 + 1) $\times$ (10-1)
= 400 + 4 + 800 - 80 + 1 0- 1 = Rs 1133

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