Applying Percents Discounts Tips and Sales Tax Discounts

Discounts A discount is an amount that is subtracted from the regular price of

Tips A tip is an amount added to a bill for service. Tip =

Sales Tax Sales tax is an amount added to the price of an item.

Example 1 A music store sign reads “ 10% off the regular price. ”

Example 2 Leslie’s lunch bill is $13. 95. She wants to leave a tip

Example 3 Marc is buying a scooter for $79. 65. The sales tax rate

Think When would it be useful to estimate the percent of a number? How

Example 4 (on your own) Norine wants to buy a beaded necklace that is

Example 5 (on your own) Alice and Wagner ordered a pizza to be delivered.

Example 6 (on your own) A bicycle sells for $139. 75. The sales tax

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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 Total Cost = Bill + Tip

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

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

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

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 * $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

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

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?

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?

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?