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　　Mathematics>Standard Multiple Choice

　　Read the following SAT test question and thenclick on a button to select your answer.

　　P=100h-2000

　　Mia's law firm has $2000 worth of expenses eachmonth. Her firm charges $100 per hour for legal advice. The given equation shows the firm'sprofit, P, after being paid for h hours of legal advice during a one-month period. What is theminimum number of hours of legal advice that Mia's firm must be paid for during one month inorder to cover the firm's monthly expenses?

　　A.20 hours

　　B.80 hours

　　C.100 hours

　　D.200 hours

　　答案：A

　　解析：

　　Choice A is correct. If the firm only covers themonthly expenses, the profit will be zero. Substituting 0 for P in the given equation andsolving for h will give the number of hours of legaladvice the firm needs to be paid for in order to break even.

　　This can be written as: P=100h-2000 0=100h-2000 h=20

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