# Amount of Sales Needed to Receive the Desired Monthly Income

Date of Exam:

**Problem**

A salesperson earns \$600 per month plus a commission of 20% of sales. Find the minimum amount of sales needed to receive a total income of at least \$1500 per month.

A. \$1500 | C. \$4500 |

B. \$3500 | D. \$2500 |

**Answer Key**

[ C ]

**Solution**

Let

$600 + 0.20x \ge 1500$

*x*= amount of sales needed$600 + 0.20x \ge 1500$

$0.20x \ge 900$

$x \ge \$ 4500$ ← *answer*