The selling price, s , of an item is s is equal to c plus m c , where c is the cost of the item and m is the percent markup based on cost. What is the formula solved for m ?

Start with s = c + mc. Subtract c from both sides to get s − c = mc, then divide both sides by c: m = (s − c)/c. This matches choice B, “m is equal to the fraction with numerator s minus c and denominator c.”

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