Inequality Word Problem for the SAT

Here is a hard SAT problem involving inequalities. A solution will be posted soon.

Level 5 Heart of Algebra

A worker earns $12 per hour for the first 40 hours he works in any given week, $18 per hour for each hour above 40 that he works each week. If the worker saves 75% of his earnings each week, what is the least number of hours he must work in a week to save at least $441 for the week?

A) 6
B) 8
C) 46
D) 47

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