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Using Proportions to Solve Percent Problems

Using Proportions to Solve Percent Problems. MCC7.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. What are they??.

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Using Proportions to Solve Percent Problems

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  1. Using Proportions to Solve Percent Problems MCC7.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.

  2. What are they?? What do you know about these examples? • simple interest, • tax, • markups and markdowns, • gratuities and commissions, • fees, • percent increase and decrease, • percent error.

  3. Use this proportion to solve percent problems:

  4. Using Proportions to Solve Percent Problems The original price of a cell phone is $99.50. Sales tax is 7%. What is the selling price of the cell phone? PercentPart 7% x 100 Whole 100 99.50

  5. Using Proportions to Solve Percent Problems **Cross multiply to solve** 7% x 100 99.50 (7) (99.50) = 100x 696.50 = 100x *divide by 100 6.97 = x *tax is $6.97. Add to original price of cell phone. 99.50 + 6.97 = 106.47 Selling price of cell phone is $106.47

  6. Using Proportions to Solve Percent Problems • You try one! • A shirt that is originally $24.95 is on sale for a discount of 20%. What is the selling price of the shirt before tax?

  7. Using Proportions to Solve Percent Problems • Tax is 6%. What is the total cost to purchase the shirt?

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