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Common Core Mathematics 6-8 
 ClusterAnalyze proportional relationships and use them to solve real-world and mathematical problems.
  
TopicRatios and Proportional Relationships
   Grade 7
  7.RP.3.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.