Question

Megan is a sales associate at a perfume store. Each week she earns $200 plus a 3% commission of all her sales. This week she earned $218. How much, in dollars, were Megan's perfume sales this week? (Do not put a $ in your answer.)

Answer 1

solve
\[200+.03x=218\] for x

Answer 2

you can just about do it in your head because you know that $18 was on commission alone. so the question is "18 is 3% of what number" which is the same as
\[\frac{18}{.03}=\frac{1800}{3}=600\]