I bought 72 identical items ,each costs same .The total cost of item was 679(you don't know the first and last digit). Find the cost of one item.
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We know that cost price = selling price - profit
cost price = selling price - profit% × cost price/100
cost price + profit% × cost price/100 = selling price
cost price(1 - profit%)/100 = selling price
cost price(100 + profit%)/100 = selling price
Also, cost price = selling price × 100/100 + profit% (on cross multiplication);
Here, selling price and loss% is known
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