Skills Handbook - Fractions, Decimals, and Percents - Exercises - Page 805: 8

45%

In order to write a fraction as a percent, we first turn the fraction into a decimal. $9/20 =.45$. In order to write a decimal as a percent, we multiply by 100, so we move the decimal point two places to the right, and then we add a percent symbol. Thus, .45 becomes 45%.