Answer:
You would save $3.6 with the discount .
Explanation:
Given : The pie store is having a 20 percent off sale on all of its pies.
To Find : If the pie you want regularly costs $18, how much would you save with the discount?
Solution :
Cost of a pie is $18
Discount % = 20 %
Discount =

=

=

So, discount is $3.6
Hence You would save $3.6 with the discount .