Question
 By selling 39 dozens of mangoes, a vendor earns a
profit equal to the sale proceeds of 13 dozens of mangoes. What is the percentage of his profit ?Solution
ATQ, The vendor sells 39 dozens of mangoes. His profit is equal to the selling price of 13 dozens. Total Selling Price = 39S (where S = selling price per dozen). Profit = 13S. Profit formula: Profit=Total Selling Price−Total Cost Price 13S=39S−39C Finding Cost Price (C): 39C=26S C = 2S/3 Profit % formula:- 
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