



 
Hi Connie, Your cost was $\$0.70$ and your selling price was $\$3.75$ so your profit is $\$3.75  \$0.70 = \$3.05.$ You can express your profit as a percentage in two different ways. To express the profit as a percentage of your cost divide the profit $(\$3.05)$ by your cost $(\$0.70)$ and multiply by $100.$ That is \[\frac{\$3.05}{\$0.70} \times 100 = 436\%\] This is sometimes called the markup. To express the profit as a percentage of your selling price divide the profit $(\$3.05)$ by your selling price $(\$3.75)$ and multiply by $100.$ That is \[\frac{\$3.05}{\$3.75} \times 100 = 81\%\] This is sometimes called the margin. I hope this helps,  


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