180 Chapter 2 Linear Equations and Inequalities 116. A wholesaler sells T-shirts to a surf shop at $8 per shirt. However, for large orders, the price per shirt is discounted by a percentage off the original price. Let x represent the number of shirts ordered. The corresponding discount is given in the table. a. If the surf shop orders 50 shirts, compute the total cost. b. Which costs more: 148 shirts or 150 shirts? Explain your answer. Number of Shirts Ordered Discount x 24 25 x 49 50 x 99 100 x 149 x 150 8% 117. A cell phone provider offers one plan that charges $4.95 for the text messaging feature plus $0.09 for each 0% 2% 4% 6% individual incoming or outgoing text. Alternatively, the provider offers a second plan with a flat rate of $18.00 for unlimited text messaging. How many text messages would result in the unlimited option being the better deal? 118. Melissa runs a landscaping business. She has equipment and fuel expenses of $313 per month. If she charges $45 for each lawn, how many lawns must she service to make a profit of at least $600 a month? 119. Madison is planning a 5-night trip to Cancun, Mexico, with her friends. The airfare is $475, her share of the hotel room is $54 per night, and her budget for food and entertainment is $350. She has $700 in savings and has a job earning $10 per hour babysitting.What is the minimum number of hours of babysitting that Madison needs so that she will earn enough money to take the trip? 120. Luke and Landon are both tutors. Luke charges $50 for an initial assessment and $25 per hour for each hour he tutors. Landon charges $100 for an initial assessment and $20 per hour for tutoring. After how many hours of tutoring will Luke surpass Landon in earnings? Group Activity Computing Body Mass Index (BMI) Materials: Calculator Estimated Time: 10 minutes Group Size: 2 Body mass index is a statistical measure of an individual’s weight in relation to the person’s height. It is computed by where W is a person’s weight in pounds. h is the person’s height in inches. The NIH categorizes body mass indices as follows: 1. Compute the body mass index for a person 54 tall weighing 160 lb. Is this person’s weight considered ideal? 2. At the time that basketball legend Michael Jordan played for the Chicago Bulls, he was 210 lb and stood 66 tall.What was Michael Jordan’s body mass index? 3. For a fixed height, body mass index is a function of a person’s weight only. For example, for a person 72 in. tall (6 ft), solve the following inequality to determine the person’s ideal weight range. 18.5 703W 17222 24.9 BMI 703W h2 Body Mass Index (BMI) Weight Status 18.5 BMI 24.9 considered ideal 25.0 BMI 29.9 considered overweight BMI 30.0 considered obese
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