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Applying Percents

Applying Percents. Discounts, Tips, and Sales Tax. Discounts. A discount is an amount that is subtracted from the regular price of an item. Discount = Price * Discount Rate Total Cost = Price - Discount. Tips. A tip is an amount added to a bill for service. Tip = Bill * Tip Rate

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Applying Percents

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  1. Applying Percents Discounts, Tips, and Sales Tax

  2. Discounts A discount is an amount that is subtracted from the regular price of an item. Discount = Price * Discount Rate Total Cost = Price - Discount

  3. Tips A tip is an amount added to a bill for service. Tip = Bill * Tip Rate Total Cost = Bill + Tip

  4. Sales Tax Sales tax is an amount added to the price of an item. Sales Tax = Price * Sales Tax Rate Total Cost = Price + Sales Tax

  5. Example 1 A music store sign reads “10% off the regular price.” If Nichole wants to buy a CD whose regular price is $14.99, about how much will she pay for her CD after the discount? • Step 1: Round $14.99 to $15 • Step 2: Find 10% of $15 by multiplying 0.10 * $15 = $1.50 • Step 3: Find the total cost after the discount $15.00 - $1.50 = $13.50

  6. Example 2 Leslie’s lunch bill is $13.95. She wants to leave a tip that is 15% of the bill. About how much should her tip be? Step 1: First round $13.95 to $14 Step 2: Think 15% of $14. 0.15 * $14 = $2.10 The tip should be about $2.10

  7. Example 3 Marc is buying a scooter for $79.65. The sales tax rate is 6%. About how much will the total cost of the scooter be? Step 1: First round $79.65 to $80. Step 2: Think 6% = 0.06. 0.06 * $80 = $4.80 The approximate sales tax is $4.80. The price of the scooter is about $80. The total cost with tax will be $80 + $4.80 = $84.80

  8. Think When would it be useful to estimate the percent of a number? How do you estimate the sales tax of an item?

  9. Example 4 (on your own) Norine wants to buy a beaded necklace that is on sale for 10% off the marked price. If the marked price is $8.49, about how much will the necklace cost after the discount?

  10. Example 5 (on your own) Alice and Wagner ordered a pizza to be delivered. The total bill was $12.15. They want to give the delivery person a tip that is 20% of the bill. About how much should the tip be?

  11. Example 6 (on your own) A bicycle sells for $139.75. The sales tax rate is 8%. About how much will the total cost of the bicycle be?

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