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When I walked into the store, I noticed that the t-shirts had a sign saying "25% off sale!". If one shirt costs $20.99 with the sale how much did the shirt cost before the sale?

Answer :

We know that $20.99 represent 75% of the original price, if we let x be the original price we can find it by solving the proportion:

[tex]\begin{gathered} \frac{x}{100}=\frac{20.99}{75} \\ x=\frac{(100)(20.99)}{75} \\ x=27.99 \end{gathered}[/tex]

Therefore, the original price is $27.99

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