<u><em>Answer:</em></u> $27.50
<u><em>Step-by-step explanation:</em></u>
First, we find what 10% of $75.00. Easiest way to do that is to move the decimal over one place to the left:
75.00 ⇒ 7.500 ⇒ 7.50
So the instructor would get a 7.50 raise added to her pay:
75.00 + 7.50 = 82.50
Finally, we divide 82.50 by 3 for each dance class:
82.50 ÷ 3 = 27.50
And there is your answer! The instructor would get $27.50 per class after their raise.
Hope this helps!