SAT数学：今日份的练习题(附答案和详解)

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下面我们就一起来看看今日份的SAT数学练习题吧，希望能够帮助到大家。

MathematicsStandard 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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