# Unit 1: Percents

```PC1: I can calculate the price of an item
after a discount has been applied.
PC2: I can calculate the price of an item
after sales tax has been applied.
PC3: I can calculate the final price of
an item (using discounts and sales tax)
PC4: I can define the terms principal,
rate, and interest.
PC5: I can calculate saving account
totals
PC6: I can calculate grand totals when
buying things on credit.
Discount?
A percent or an amount of decrease in
the price of an item
Sale price = Original price - Discount
Discussion Example #1:
Discussion Example #2:
Discussion Example #3:
In a video store, a DVD that sells for \$15 is
marked &quot;10% off.&quot; What is the discount? What
is the sale price of the DVD?
Group Examples: Complete the following problems
together as a group. Everyone must write the problem
down and complete all of the work required. After
ample time has been given students will be picked to
go to the board to work the problem out and explain.
For each problem, find the total cost.
6.) In a department store, a \$40 dress is marked,
&quot;Save 25%.“
7.) In a grocery store, a \$12 case of soda is labeled,
&quot;Get a 20% discount.&quot; What is the discount? What is
the sale price of the case of soda?
8.) A pizzeria has a coupon that reads, &quot;Get 1/3 off a
\$9.00 cheese pizza.&quot;
Individual Practice: Complete the following
problems ON YOUR OWN! You need to write the
problem down and complete all of the work required.
Find the total cost.
9.) Molly wants to buy a skirt. The original price was
\$29. The skirt is 30% off.
10.) Sammy buys his clothes at Super Discounts.
He bought shoes regularly priced at \$40 for 25% off.
11.) Sammy also bought a jacket regularly priced at
\$100 for 20% off
12.) A CD player that regularly sells for \$79.00 is on
sale at a 15% discount.
13.) Doughboys is having a special today only. You can
get 2/5 off of a large pizza (that normally costs
\$12.99).
```