Answer:

Step-by-step explanation:

Factor both the numerator and denominator

The
's cancel out
The equation in its simplest form is 
Hope this helps!
800 is 100% so 20 is 40% of 800.
You would do 150/15=10 since this is a percent change it to a decimal(.10) to check do 150x.10=15 and 15/.10=150
First step
12 x 1.3
Second step
15.6 x 7.5
The answer is 117 :)