Commission, Sales Tax

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Discount and Sales Tax

• Finding Discount and New Sale Price
• Finding Tax
• Simple Interest
• Percent of Increase/Decrease

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QUIZ
Finding the Discount and New Sale Price
Janie wants to buy a pair of shoes that cost 50.
They are on sale for 15 off. What is the new
price? FirstChange the percent into a decimal by
dropping the percent sign and moving the
decimal two places to the left. 15
15. .15 SecondMultiply the original price
(50) by the decimal (.15). 50 x .15
7.5 (7.50) This is the discount. ThirdSubtra
ct the discount from the original amount that is
the amount Janie paid for the shoes. 50.00 -
7.50 42.50
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Finding Tax
QUIZ
John bought a new suit. His suit cost 125.00
He has to pay 6 sales tax on top of that. What
was the total amount that John paid? FirstChange
the percent into a decimal by dropping the
percent sign and moving the decimal two places
to the left. 6 6. .06 SecondMultiply the
amount of the suit by the decimal. 125 x
.06 7.5 (7.50) ThirdAdd the sales tax
to the original amount. 125.00 7.50
132.50
This is the tax!
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Simple Interest
Simple Interest is the interest paid only on the
principal. The formula is I p r t
means to multiply! Example Jamie invested
700 at 5 for 6 years. How much simple interest
did she earn? Step 1 Change the decimal into a
percent 5 .05 Step 2 Plug the
numbers into the formula I 700
.05 6 Step 3 Multiply! I
210
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Percent of Increase and Decrease
Follow this formula percent change
increase/decrease amount 100
original amount Example Incre
ase from 80.00 to 100.00 x
20 100
80 Decrease from 80 to 75 x
5 100
80
x 25
x 6.25
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Discount Quiz

• Keeley wants to buy a DVD that costs 24. It is
  on sale for 25 off. After the sale, how much
  will Keeley pay for the DVD?
• 21.50 b. 1.00 c. 6.00 d. 18.00
• A sofa cost 1,200. It is on sale for 30 off.
  What is the new price of the sofa?
• a. 120 b. 360 c. 840 d. 1560

Review
7
Tax Quiz

• A bath tub costs 1435. How much will the tub
  cost after paying sales tax if the tax is 6?
• 86.10 b. 1348.90 c. 1521.10 d. 1441.00
• A blouse cost 27.00. A pair of pants cost
  20. If Jane buys both the shirt and the blouse
  and pays 4 sales tax, how much will it cost all
  together?
• a. 48.88 b. c. 1.88 c. 45.12 d.
  47.00

Review
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12
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