1. Sales Tax and Total Cost
Definitions:
1) Sales tax - tax on the sale of an item or
service (always a percentage) that is added to
the price.
2) Total cost – the amount of your purchase
plus the sales tax rounded to the nearest
cent.

2. Taxes
Formulas: Sales Tax ($) %
=
Original($) 100
Total Cost = Price + Sales Tax

3. Ex. 1: Find the sales tax and the total cost to
the nearest cent.
Let’s use the sales tax
A) Price: $20.00 proportion to solve this
problem.
Tax Rate: 4%
Sales Tax ($) %
=
Original($) 100

4. Find the sales tax and the total cost
to the nearest cent.
B) Price: $26.98 There is another way
to find the percent of a
Tax Rate: 5% number. Do you know
what it is?
We are trying to find 5% of $26.98, right?
To find the percent of a number, you change
the percent (5%)into a decimal (0.05) and
multiply it times the other number (26.98)!

5. B) Price: $26.98
Tax Rate: 5%
Let’s try it!

6. EKS. tax %
3(A) 1. =
1(B) original 100
AKS – 1 & 2
BJ – TSW
2. Final Cost = Original Cost + Tax
Use percents
calculate
xes, tips, 1. Original Sales Tax Tax-Round to
mmission, Cost Rate the nearest Total
nd total cost.
hundredth
ocabulary:
eview
Original Cost Cost($)
Tax
Final Cost
Percent
$10.00 8%
Tip
Commission
Engage -

7. tax % 2. Original Cost $87.25
=
original 100
Sales Tax Rate 7%
Final Tax-Round to the
Cost nearest hundredth
=
Original
Cost +
Tax
≈
approximately
Total Cost($)

8. tax % 3. Original Cost $10.00
=
original 100
Sales Tax Rate 7.25%
Final Tax-Round to the
Cost nearest hundredth
=
Original
Cost +
Tax
≈
approximately
Total Cost($)

9. tax % 4. Original Cost $25.00
=
original 100
Sales Tax Rate 8.25%
Final Tax-Round to the t 8.25
Cost =
nearest hundredth 25 100
=
0 0%
Original = 25 x 8.25
Part t 8.25%
Cost + 50%
Tax t = 206.25
100
Whole25 100% t = 2.0625
≈
approximately t ≈ 2.06
Total Cost($) 25.00
+ 2.06
$27.06

10. tax % 5. Original Cost $59.95
=
original 100
Sales Tax Rate 8.5%
Final Tax-Round to the t 8.5
Cost =
nearest hundredth 59.95 100
=
0 0%
Original = 59.95 x 8.5
Part t 8.5%
Cost + 50%
Tax t = 509.575
100
59.95 100%
≈ Whole t = 5.09575
approximately t ≈ 5.10
Total Cost($) 59.95
+ 5.10
$65.05
#5

11. tax % 6. Original Cost $115.05
=
original 100
Sales Tax Rate 8.75%
Final Tax-Round to the t 8.75
Cost nearest hundredth 115.05 = 100
=
Original = 115.05 x 8.75
Cost +
Tax t = 1006.6875
100
≈
t = 10.066875
approximately t ≈ 10.07
Total Cost($) 115.05
+ 10.07
$125.12
#6

12. tax % 7. Original Cost $250.00
=
original 100
Sales Tax Rate 8.25%
Final Tax-Round to the t 8.25
Cost =
nearest hundredth 250 100
=
Original = 250 x 8.25
Cost +
Tax t = 2062.5
100
≈
t = 20.625
approximately t ≈ 20.63
Total Cost($) 250.00
+ 20.63
$270.63
#7

13. tax % 8. Original Cost $475.25
=
original 100
Sales Tax Rate 7.5%
Final Tax-Round to the t 7.5
Cost =
nearest hundredth 475.25 100
=
475.25 x 7.5
Original =
Cost +
Tax t = 3564.375
100
≈
t = 35.64375
approximately t ≈ 35.64
Total Cost($) 475.25
+ 35.64
$510.89
#8

14. tax % 8. Original Cost $1,050.00
=
original 100
Sales Tax Rate 7.5%
Final Tax-Round to the t 7.5
Cost =
nearest hundredth 1050 100
=
Original = 1050 x 7.5
Cost +
Tax t = 7875
100
t = 78.75
Total Cost($) 1050.00
+ 78.75
$1128.75
#9

15. tax % 9. Original Cost $10,500.00
=
original 100
Sales Tax Rate 8.25%
Final Tax-Round to the t 8.25
Cost =
nearest hundredth 10500 100
=
10500 x 8.25
Original =
Cost +
Tax t = 86625
100
t = 866.25
Total Cost($) 10500.00
+ 866.25
$11366.25
#10

16. tax % 11. Original Cost $37.00
=
original 100
Sales Tax Rate 8.25%
Final #11. Tax-Round to t 8.25
Cost =
the nearest 37 100
= hundredth
37 x 8.25
Original =
Cost +
Tax t = 305.25
100
≈
t = 3.0525
approximately t ≈ 3.05
#12. Total Cost($) 37.00
+ 3.05
40.05