91Ó°ÊÓ

In the following exercises, solve the simple interest problem. Fresia lent her son \(\$ 5,000\) for college expenses. Three years later he repaid her the \(\$ 5,000\) plus \(\$ 375\) interest. What was the rate of interest?

In the following exercises, solve the simple interest problem. In 6 years, a bond that paid 5.5\(\%\) earned \(\$ 594\) interest. What was the principal of the bond?

In the following exercises, determine whether each equation is a proportion. $$ \frac{5}{13}=\frac{30}{78} $$

Determine whether each equation is a proportion. $$ \frac{12}{18}=\frac{6.99}{10.99} $$

In the following exercises, solve each proportion. $$ \frac{1.2}{1.8}=\frac{d}{6} $$

In the following exercises, solve the proportion problem. After a workout, Dennis takes his pulse for 10 sec and counts 21 beats. How many beats per minute is this?

In the following exercises, solve the proportion problem. Teresa is planning a party for 100 people. Each gallon of punch will serve 18 people. How many gallons of punch will she need?

In the following exercises, convert each percent to (a) a decimal (b) a simplified fraction. $$ 24 \% $$

In the following exercises, convert each fraction to a percent. (Round to 3 decimal places if needed.) $$ \frac{1}{3} $$

In the following exercises, convert each fraction to a percent. (Round to 3 decimal places if needed.) $$ \frac{11}{12} $$