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Answer:
$26.25
Step-by-step explanation:
If a store is having a 20% off sale, that means 80% of the original price is left. If 21 is 80% of the original price, we can create an equation
0.8x = 21
Divide by 0.8 on both sides
x = 26.25
The original price was $26.25
Hope this helps :)