Please answer

If the selling price of an orange is Rs1.50 and there is a loss of 10%. Find the cost price per dozen.

Selling price of an orange = Rs.1.50
Loss = 10%
So the cost price of an orange = 1.50+1.50×10100 = 1.50+0.15 = Rs.1.65
Therefore the cost price per dozen = 1.65×12 = Rs.19.8

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