Book Maths Puzzle Percentage

I know the answer is $29., however, I need help in displaying the answer as an equation...
At a 20% off sale, a hat cost $23.19. How much was the original price?

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Book Other Question

Reduce to lowest terms

(x^2-4xy+4y^2)/(3xy-6y^2)
Reduce to lowest terms

(x^2-4xy+4y^2/(3xy-6y^2)