i cant find the regular price of 18.00 discount of 20%

Question

If everything in a store is 20% off, and the discounted price of an item is $18.00, what is the regular price?

 

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Answer 1

18/(1-.2) = 18/.8 = 9/.4 = $22.50 = regular price

if it''s 20% off, you pay 80% of the regular price

.8(22.5) = 18

18/.8 = 22.5

20% = 1/5

1/5 0f $22.50 = $4.50

$22.50 - $4.50 = $18