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a man buys a dozen cameras for $1800. He sells them at a profit of $36 each. Express his profit as a percentage of his selling price. ​

Answer :

First of all, we need to deduce the price of a single camera:

[tex]\dfrac{1800}{12}=150[/tex]

Now, we know that he profits 36 dollars from each camera. So, we are asking: which percentage of 150 is 36? We have

[tex]36 = 150\cdot\dfrac{x}{100}[/tex]

This equation literally says: 36 is x-percent of 150. And we need to solve for x:

[tex]x=\dfrac{36\cdot 100}{150} =24[/tex]

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