Ratios -- Equivalent ratios -- Reducing ratios -- Rates -- Ratios and fractions -- Ratios and decimals -- Unit ratios and rates -- The better buy -- Distance, rate, and time -- Proportions -- Solving proportions -- Ratios in geometry -- Scale drawings and models -- The golden ratio -- Alternate proportions -- Percents and ratios -- Percents, fractions, and decimals -- Percents and proportions -- The percent equation -- Percents larger than 100% -- Relating numbers by percents -- Finding the total -- Percent of change -- Sales tax and discounts -- Commission and income -- Tips -- Simple interest -- Compound interest.