Day 8 - Percents and Total Cost answers.ppt

Percent and Total Cost

2. We often have to add or subtract percentages
to find the total cost.
•Examples of percents that add to the cost
–Tip, or gratuity
–Tax
–Interest
–Mark-up
•Examples of percents that subtract from the cost
–Discount
–Coupon
–Sale
–Mark-down

3. Ex 1) A new soccer ball is priced at
$37. If the sales tax is 8%, what is the
total cost to buy the soccer ball?
Total cost = price + tax
whole
part
100
percent

96.2$
37100
8


x
x
Find the tax.
Add the price and the tax to
find the total cost.
Total cost = $37 + $2.96
Total cost = $39.96
The soccer ball costs $39.96 including tax.

4. Ex 2) A movie ticket is regularly priced at $9.50.
Every Tuesday, the movie theater offers a 20%
discount on tickets purchased for the evening
movies. If you use this discount, what is the sale
price of a movie ticket?
Sale price = price - discount
whole
part
100
percent

90.1$
50.9100
20


x
x
Find the discount.
Subtract the discount from the
regular price to find the sale price.
Sale price = $9.50 - $1.90
Sale price = $7.60
The sale price of a movie ticket is $7.60.

5. Ex 3) The bill for lunch was $28, and
Paul left a 15% tip. How much was
the total cost including the tip?
Total cost = bill + tip
whole
part
100
percent

20.4$
28100
15


x
x
Find the tip.
Add the bill and the tip to
find the total cost.
Total cost = $28 + $4.20
Total cost = $32.20
The total cost was $32.20 including the tip.

6. Ex 4) The Moore family wants to buy a new
computer regularly priced at $1,049. Mrs. Moore
has a coupon for 20% off any item in the store.
How much will the computer cost if they use the
coupon?
Sale price = price – coupon savings
whole
part
100
percent

80.209$
1049$100
20


x
x
Find the coupon savings.
Subtract the coupon savings
from the regular price to find
the sale price.
Sale price = $1,049 - $209.80
Sale price = $839.20
The price of the computer with the coupon is $839.20.