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13. Pricing The cost of a product to a retailer is $3.40. If the
retailer wishes to make a profit of 20% on the selling price, at
what price should the product be sold?

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.