



 
Hi Anson, If the cost price is $\$50$ and the selling price is $\$88$ then the profit is $\$88  \$50 = \$38.$ The problem in expressing this as a percentage is the necessity to ask "percentage of what?" From the seller's point of view he bought the item for $\$50$ and sold it for $\$88$ so his profit is $\large \frac{\$33}{\$50} \times \normalsize 100 = 66\%$ of what it cost him. From the buyer's point of view he paid $\$88$ so the profit of $\$38$ is $\large \frac{\$38}{\$88} \times \normalsize 100 = 43.2\%$ of what he paid for it. I hope this helps,  


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