A shopkeeper bought some mangoes at a rate of 8 mangoes for ₹5 and then sold them at a rate of ₹9 per dozen. Find his percentage of profit or loss.

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Solution

Cost price of 8 mangoes (C.P) = ₹5

Selling price of 12 mangoes = ₹9

So, selling price of 1 mango = ₹ $\frac{9}{12}$
= ₹0.75

Selling price of 8 mangoes (S.P)
= Selling price of 1 mango $\times 8 = 0.75 \times 8 = ₹ 6$

S.P > C.P, so the shopkeeper has made a profit in this sale.

Profit = Selling Price - Cost Price =
₹6 - ₹5 = ₹1

$Profit % = \frac{profit}{C.P} \times 100$

$= \frac{1}{5} \times 100 = 20 %$

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