How to calculate the problem!

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1) subtract the selling price from the cost

28-16=12 <~ that's the markup

2) take the markup price and divide it by the original cost then move the decimal two places to the right

12/16=0.75=75% <~ that's the percent increase/markup

3) if your trying to find the markdown and the percent decrease you do the same thing

This is how you calculate a problem

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How to find the percent increase/markup

How to find the markup