Applications of Percent

Warm Up

1. 5% of $30 = 2. 15% of $70 =

3. 0.4% of $100 = 4. 150% of $22 =

5. 1% of $80 = 6. 200% of $5

• Sales tax, tip, and a markup are all calculated by changing the percent to a decimal and then multiplying that decimal by the original amount. Total cost can then be found by adding this product to the original amount.

• Simple interest is found by multiplying the percent, written as a decimal, times the original amount times the time in years. Total saved or borrowed can then be found by adding this product to the original amount, or principal.

Franklin and Jose both have a plan to save money. Complete the table to determine whose plan will earn the most interest.

Franklin’s Plan Jose’s PlanAmount

Deposited$200.00 $225.00

Rate 3% 2.5%Time (in years) 3 4Simple Interest

Earned

Ariana buys an ant farm from a store near her home. The ant farm’s price is $12.00, and the

sales tax is 7%. What is the total price of the ant farm?

Quincy deposits $400.00 in a new bank account that earns 4% simple interest per year. What is the total amount in the account after 3 years?

Cabrini goes out for dinner, and the price of her meal is $18.00. The sales tax on the meal is 6%, and she also wants to leave a 20% tip. What is

the total price of the meal?

Exit TicketFind the indicated percent.1. 6% of $120.00 2. 0.5% of $44.003. Jonah’s restaurant bill comes to $25.65, and he

leaves a 15% tip. What is Jonah’s total restaurant bill?

4. Alicia borrowed $3,000.00 from the bank at a rate of 12% simple interest per year. How much interest did she pay in 4 years?

5. Nikos finds a toy train set on sale for 20% off at a toy store. The original price was $35.00. Nikos must also pay 6.5% sales tax. What is the total amount Nikos must pay for the train set?