Unit Review: Percents & consumer math

E.1Interest is compounded once a year. Round to the nearest cent.

1. 1
   Sam deposits $\text{\$}2,200.00$ in an account that earns $6\%$ interest compounded annually. What is the balance after $3$ years?
2. 2
   Jin deposits $\text{\$}3,400.00$ in an account that earns $3\%$ interest compounded annually. What is the balance after $3$ years?
3. 3
   Ana deposits $\text{\$}1,200.00$ in an account that earns $4\%$ interest compounded annually. How much interest does the account earn in $2$ years?
4. 4
   Grace deposits $\text{\$}1,000.00$ in an account that earns $3\%$ interest compounded annually. How much interest does the account earn in $3$ years?

E.2E.3Answer each question.

1. 5
   With $4\%$ sales tax, a backpack costs $\text{\$}186.16$ in all. What was the price before tax?
2. 6
   With $10\%$ sales tax, a video game costs $\text{\$}81.40$ in all. What was the price before tax?
3. 7
   After a $15\%$ discount, a jacket costs $\text{\$}232.90$. What was the original price?
4. 8
   After a $40\%$ discount, a backpack costs $\text{\$}175.80$. What was the original price?
5. 9
   A dinner bill is $\text{\$}67.00$ before tax. The tax is $8\%$ and the tip is $18\%$, both of the original bill. What is the total?

E.3Answer each question. (continued)

1. 10
   A dinner bill is $\text{\$}66.00$ before tax. The tax is $8\%$ and the tip is $20\%$, both of the original bill. What is the total?
2. 11
   A dinner bill is $\text{\$}59.00$ before tax. The tax is $7\%$ and the tip is $20\%$, both of the original bill. What is the total?
3. 12
   A dinner bill is $\text{\$}64.00$ before tax. The tax is $7\%$ and the tip is $15\%$, both of the original bill. What is the total?

E.4Find each unit price. Write the better buy.

1. 13
   Which is the better buy for rice: $2$ lb for $\text{\$}0.96$, $11$ lb for $\text{\$}4.40$, or $12$ lb for $\text{\$}5.04$?
2. 14
   Which is the better buy for trail mix: $8$ oz for $\text{\$}3.28$ or $19$ oz for $\text{\$}7.41$?

E.4Find each unit price. Write the better buy. (continued)

1. 15
   Which is the better buy for orange juice: $48$ fl oz for $\text{\$}14.40$, $67$ fl oz for $\text{\$}20.77$, or $90$ fl oz for $\text{\$}24.30$?
2. 16
   Which is the better buy for paper towels: $4$ rolls for $\text{\$}4.08$, $5$ rolls for $\text{\$}4.95$, or $8$ rolls for $\text{\$}7.20$?

E.1Compound Interest

1. 1$\text{\$}2,620.24$
2. 2$\text{\$}3,715.27$
3. 3$\text{\$}97.92$
4. 4$\text{\$}92.73$

E.2E.3Answer each question.

1. 5$\text{\$}179.00$
2. 6$\text{\$}74.00$
3. 7$\text{\$}274.00$
4. 8$\text{\$}293.00$
5. 9$\text{\$}84.42$
6. 10$\text{\$}84.48$
7. 11$\text{\$}74.93$
8. 12$\text{\$}78.08$

E.4Unit Prices: Which Is the Better Buy?

1. 13$11$ lb for $\text{\$}4.40$ ($\text{\$}0.40$ per lb)
2. 14$19$ oz for $\text{\$}7.41$ ($\text{\$}0.39$ per oz)
3. 15$90$ fl oz for $\text{\$}24.30$ ($\text{\$}0.27$ per fl oz)
4. 16$8$ rolls for $\text{\$}7.20$ ($\text{\$}0.90$ per roll)