Answer:
The expression that can be used is 0.80x
Step-by-step explanation:
Let
x ----> original price of an item
Remember that
[tex]100\%-20\%=80\%[/tex]
That means---> the sale price is 80% of the original price
To find out the sale price, determine the 80% of the original price
[tex]80\%=80/100=0.80[/tex] ----> percentage in decimal form
Multiply the original price by the percentage in decimal form to obtain the sale price
so
[tex]0.80x[/tex]