Let's forget about the formula for a minute,

1. Daily sales =
   
2. Hours Worked times Hourly Quota =
   
3. Commission rate [from table] =

Since this sounds like homework, what do you get for the three independent questions above.

After you get the three answers above, work the answer out on paper.

What do you get?

And finally, why do you think the answer is $108.36?