Academic Worksheet 7.5
Find the percent of increase or decrease.
1. Original: 800
2. Original: 240
New: 1216
New: 156
Find the new amount.
4. Increase 300 by 54%.
6. Decrease 225 by 68%.
3. Original: 900
New: 324
5. Increase 2850 by 18%.
7. Decrease 700 by 49%.
8. Last year, 12,500 people participated in a charity 10K walk. This year, 14,000 people participated in
the walk. By what percent did the number of participants change from last year to this year?
9. In 1991, sporting good stores sold about $15 billion in merchandise. In 2001, sporting good stores sold
about $28 billion in merchandise. Find the percent of change from 1991 to 2001.
10. There were 80 spectators at the first baseball game of a season. The number of spectators increased
by 75% from the first game to the last game of the season. How many spectators were at the last
baseball game of the season?
11. When a video game console is released for sale, the retail price is $190. After 18 months, the retail
price is lowered by 20%. What is the retail price of the video game console after 18 months?
Academic Worksheet 7.6
Use the given information to find the new price.
1. Wholesale price: $18
2. Original price: $86
Markup percent: 105%
Discount percent: 60%
3. Wholesale price: $102
Markup percent: 50%
4.
A store purchases a T-shirt for $8.10. The store marks up the price by 90%. What is the retail price of
the T-shirt?
5. You buy a book that is on sale for 33% off the original price of $18. What is the sale price?
Use the given information to find the total cost.
6. Original price: $47
Sales tax: 8%
8. Food bill: $9
Sales tax: 6%
Tip: 20%
7. Original price: $71
Sales tax: 5%
9. Food bill: $40
Sales tax; 6%
Tip: 18%
10. You and your friend are ordering a meal at a restaurant. Your meal costs $8 and your friend’s meal
costs $9. Both meals are on the same bill. You leave a 16% tip. The sales tax is 7%. What is the total
cost of the meal?
11. The fare for a taxi ride is $38. You give a 10% tip. What is the total cost of the taxi ride?
Academic Worksheet 7.7
For an account that earns simple annual interest, find the interest and the balance of the account.
1. 𝑃 = $200, 𝑟 = 4%, 𝑡 =
2. 𝑃 = $750, 𝑟 = 3.5%, 𝑡 =
3. 𝑃 = $1200, 𝑟 = 5%, 𝑡 =
3 years
7 years
18 months
4.
A $2500 bond earns 3% simple annual interest. What is the interest earned after 5 years?
5. Cassandra loans Randal $400 and charges him 3% simple annual interest. Randy promises to repay
Cassandra in 2 years. How much will Randy have to pay Cassandra?
Find the unknown quantity for an account that earns simple annual interest.
6. 𝐴 = $1202.50, 𝑃 = $925, 𝑟 = 6%, 𝑡 =?
7. 𝐴 = $672, 𝑃 = $600, 𝑟 =?, 𝑡 = 6 years
8. You deposit $750 into an account that earns simple annual interest. After 3 years, the account balance
is $930. Find the annual interest rate.
9. You deposit $250 into an account that earns 7.2% simple annual interest. After how many years will
the account have a balance of $700?