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Rangeela, a dishonest milk seller, when buys milk from his supplier he takes 50 ml extra for every litre but when he sells the same he gives 50 ml less for every litre. If the cost price of milk is Rs. 42/litre and selling price is Rs. 56/litre, then calculate the profit or loss he incurred during a day if he bought 20 litres of milk a day from his supplier.

Rangeela, a dishonest milk seller, when buys milk from his supplier he takes 50 ml extra for every litre but when he sells the same he gives 50 ml less for every litre. If the cost price of milk is Rs. 42/litre and selling price is Rs. 56/litre, then calculate the profit or loss he incurred during a day if he bought 20 litres of milk a day from his supplier. Correct Answer Rs. 28.7

Given:

CP = Rs. 42/litre

SP = Rs. 56/litre

While buying, Rangeela takes 50 ml extra

While selling, Rangeela gives 50 ml less

Purchase from supplier in a day = 20 litres

Formula used:

Profit = SP - CP

Calculation:

Cost price of 1 litre of milk = Rs. 42

He takes 50 ml extra so by giving the cost of 1 litre of milk he takes 1.05 litres.

He bought 20 litres from his supplier  

He actually bought = 1.05 × 20 = 21 litres

He sells 50 ml less for every litre 

For 21 litre he saves 1.05 litres 

So his total sale is 22.05 litres and he paid for only 20 litres.

Rangeela makes his profit from (22.05 - 20) litres which is 2.05 litres 

Cost price of 2.05 litres = Rs. (42 × 2.05)

⇒ Rs. 86.1

Selling price of 2.05 litres = Rs. (56 × 2.05) = Rs. 114.8

⇒ Rs. 114.8

Profit = SP - CP

⇒ Rs. (114.8 - 86.1)

⇒ Rs. 28.7

∴ Rangeela earned a profit of Rs 28.7.

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