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EXAMPLE 3 Writing and Solving an Inequality
Owning a Business
You use the Internet to sell mouse pads. You pay a wholesaler $6 for each mouse pad. You then sell the mouse pads for $10 each. You pay $21 per month for Web page hosting. How many mouse pads should you sell each month to earn a profit?
SOLUTION
To earn a profit, your revenue must be greater than your expenses
EXAMPLE 3 Writing and Solving an Inequality
10x > 6x + 21 Write an inequality.
4x > 21 Subtract 6x from each side.
x > 5.25 Divide each side by 4.
ANSWER
You cannot sell part of a mouse pad. So, you should sell at least 6 mouse pads per month to earn a profit.
GUIDED PRACTICE for Example 3
Nutrition4.
A membership at a nutrition store costs $20 per year. You can buy vitamins for $18 a bottle without a membership, and $15 a bottle with a membership. How many bottles of vitamins do you need to buy each year to make a membership worthwhile?
ANSWER
7 or more bottles.
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