## Elementary Technical Mathematics

The base is the total amount of oil, 4.5 qt. The part is the amount in the filter, 0.3 qt. The percent is unknown. $R=\frac{P}{B}=\frac{0.3}{4.5}=0.0666\overline6$ To convert the rate to a percent, move the decimal two places to the right. Round to the nearest tenth. $0.0666\overline6\approx6.7\%$