## Thinking Mathematically (6th Edition)

Fill the blank with $0.85x$
If the original price is x, we can say that ($100\%$ of the price) is x. A reduction of 15$\%$ means that I pay $100\%-15\%=85\%$ of the full price. $85\displaystyle \%=\frac{85}{100}=0.85.$ "(fraction) of (quantity)" is written as (fraction) $\times$ (quantity). So, the price I pay is $(0.85)$ of (x) or $0.85x$. Fill the blank with $0.85x$