140 Chapter 2 Linear Equations and Inequalities Skill Practice 1. Find the amount of tax on a portable CD player that sells for $89.Assume the tax rate is 6%. 2. Find the total cost including tax. Answers 1. The amount of tax is $5.34. 2. The total cost is $94.34. 3. 37.5% of the men surveyed prefer basketball. In Example 2, we solve a problem in which the percent is unknown. Finding an Unknown Percent Example 2 A group of 240 college men were asked what intramural sport they most enjoyed playing.The results are in the graph.What percent of the men surveyed preferred tennis? Football 60 Tennis 30 Baseball 40 Soccer 20 Basketball 90 Solution: Step 1: Read the problem. Let x represent the unknown percent Step 2: Label the variable. (in decimal form). The problem can be rephrased as: 30 is what percent of 240? Step 3: Write a verbal model. 30 240 Step 4: Write a mathematical equation. Step 5: Solve the equation. Divide both sides by 240. Step 6: Interpret the results. Change the value of x to a percent form by multiplying x 30 240x 30 240 240x 240 0.125 x 0.125 100% 12.5% In this survey, 12.5% of men prefer tennis. by 100%. Skill Practice Refer to the graph in Example 2. 3. What percent of the men surveyed prefer basketball as their favorite intramural sport?
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