## Basic College Mathematics (10th Edition)

$\frac{9}{50}$ 0.18 18%
Fraction Write the ratio as a fraction and simplify. $\frac{90}{500}$ = $\frac{90\div10}{500\div10}$ = $\frac{9}{50}$ Decimal Write the ratio as a fraction and divide. $\frac{90}{500}$ $\ \ \ \ \ \ \ \ \ 0.18$ $500)\overline{90.00}$ $\ \ \ \ \ \ \ \ \underline{500}$ $\ \ \ \ \ \ \ \ 4000$ $\ \ \ \ \ \ \ \ \underline{4000}$ $\ \ \ \ \ \ \ \ \ \ \ \ \ \ 0$ Percent Write as a proportion and solve for x using cross products. $\frac{90}{500} = \frac{x}{100}$ $500x = 90\times100$ $\frac{500x}{500} = \frac{9000}{500}$ $x = 18$