91Ó°ÊÓ

Find the percent of each number mentally. $$20 \% \text { of } 105$$

Solve each problem using the percent equation. 9 is what percent of \(25 ?\)

On a set of architectural drawings for a new school, the scale is \(\frac{1}{2}\) inch \(=\) 9 feet. Find the actual length of each room. $$\begin{array}{|l|c|}\hline \quad \quad \quad \text { Room } & \text { Drawing Distance } \\ \hline \text { Cafeteria } & 8 \frac{1}{4} \text { inches } \\\\\hline\end{array}$$

Use the percent proportion to solve each problem. Round to the nearest tenth. What percent of 36 is \(19.8 ?\)

As teenagers leave a concert, every 10th person is surveyed. They are asked if they would buy a T-shirt. One hundred forty out of a total of 800 people surveyed said yes. Is this sampling method valid? If so, how many people would you expect to buy T-shirts at the next concert if 7000 attend? Explain your reasoning.

Solve each proportion. $$\frac{2}{15}=\frac{c}{72}$$

Express each decimal or fraction as a percent. Round to the nearest tenth, if necessary. $$0.45$$

Express each ratio as a fraction in simplest form. 6 ladybugs out of 27 insects

Complete each table. Determine whether the pattern forms a proportion. If so, write an equation relating the two quantities. Party planning. It will cost 7 dollars per person to hold a birthday party at the recreation center. $$\begin{array}{|l|l|l|l|l|}\hline \text { Number of guest } & 6 & {}{} \\\\\hline \text { Cost } & & & & \\\\\hline\end{array}$$

Use the percent proportion to solve each problem. Round to the nearest tenth. What percent of 145 is \(52.2 ?\)