Tax Tip and Discount Adding and Subtracting Percents

Tax, Tip and Discount Adding and Subtracting Percents

Adding Percents • When we are adding a percentage onto an original amount, we can add the percent to 100%. – This can be used to find the total amount after some percentage has been added. (ex. Tax) – Takes one step out of solving problems. • Ex. You are buying a shirt that costs $12 with a 2. 6% sales tax. 100% + 2. 6% = 102. 6 % = 1. 026 (decimal) 12 * 1. 026 = 12. 312 ≈ $12. 31

Practice 1. Sarah is buying a new pair of shoes for $37. 50. The sales tax is 8. 3%. How much will she pay? 2. At Alex’s furniture store, they charge a 12% sales tax. If a bed frame costs $226, how much will the consumer pay in total?

Subtracting Percents • When we are taking away a certain percentage from an original amount, we can subtract the percent from 100%. – This can be used to find the total amount after some percentage has been subtracted. (ex. discounts) – Takes one step out of solving problems. • Ex. These $45 shorts are on sale for 20% off. How much do they cost? 100% - 20% = 80% = 0. 80 (decimal) 45 * 0. 80 = $36

Practice 1. At Camilla's antique shop, everything is 30% off. How much will I pay for a table that costs $147. 50? 2. After a 15% off sale, some jeans were $11. 50. how much were the jeans before the sale? 100% - 15% = 85% 11. 50 = 85% of the total cost Set up a proportion and solve!