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A shirt is on sale at $20\%$ off. The current price is $\$51.00\text{.}$ Write an equation based on this scenario where the variable represents the shirt’s original price.

Use x for the variable.

Solution

Let $x$ represent the original price of the shirt. Since $20\%$ is removed to bring the cost to $\$51\text{,}$ we can set up the equation:

$\begin{aligned} \pinover{x}{original}\pinover{-}{minus}\pinover{0.20}{20\%}\pinover{\cdot}{of}\pinover{x}{original}\amp\pinover{=}{is}\pinover{51}{\$51} \end{aligned}$