Hi Jackie,

The units tell you what to do. You have dollars per hour, square feet per hour and you want dollars per square foot. That is you have

\[\frac{\$}{hr}, \frac{\mbox{ square feet}}{hr} \mbox{ and you want } \frac{\$}{\mbox{square foot}}.\]

But if you have

\[\frac{\$}{hr} \times \frac{hr}{\mbox{ square foot}}.\]

Then the hours cancel and you have

\[\frac{\$}{\mbox{ square foot}}.\]

Hence

\[12 \frac{\$}{hr} \times \frac{1}{750} \frac{hr}{\mbox{ square foot}} = \frac{12}{750} \frac{\$}{\mbox{ square foot}}.\]

I hope this helps,
Penny