Using proportions to solve percent problems

Analyze proportional relationships and use them to solve real-world and mathematical problems. Compute unit rates associated with ratios of fractions, including ratios of lengths, areas and other quantities measured using proportions to solve percent problems like or different units.

4 miles per hour, equivalently 2 miles per hour. Recognize and represent proportional relationships between quantities. Decide whether two quantities are in a proportional relationship, e. Use proportional relationships to solve multistep ratio and percent problems. Examples: simple interest, tax, markups and markdowns, gratuities and commissions, fees, percent increase and decrease, percent error.