생활 속 백분율 단원 종합

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

1. 1
   Jin deposits $\text{\$}4,600.00$ in an account that earns $5\%$ interest compounded annually. How much interest does the account earn in $3$ years?
2. 2
   Sam deposits $\text{\$}800.00$ in an account that earns $3\%$ interest compounded annually. What is the balance after $2$ years?
3. 3
   Ana deposits $\text{\$}700.00$ in an account that earns $2\%$ interest compounded annually. How much interest does the account earn in $4$ years?
4. 4
   Omar deposits $\text{\$}2,100.00$ in an account that earns $5\%$ interest compounded annually. How much interest does the account earn in $2$ years?

E.2E.3Answer each question.

1. 5
   With $4\%$ sales tax, a lamp costs $\text{\$}96.72$ in all. What was the price before tax?
2. 6
   With $7\%$ sales tax, a pair of shoes costs $\text{\$}230.05$ in all. What was the price before tax?
3. 7
   With $7\%$ sales tax, a guitar costs $\text{\$}150.87$ in all. What was the price before tax?
4. 8
   After a $20\%$ discount, a bike costs $\text{\$}239.20$. What was the original price?
5. 9
   A $\text{\$}144.00$ backpack is marked $40\%$ off. Then the store takes another $10\%$ off the sale price. What is the final price?

E.3Answer each question. (continued)

1. 10
   A dinner bill is $\text{\$}83.00$ before tax. The tax is $8\%$ and the tip is $18\%$, both of the original bill. What is the total?
2. 11
   A $\text{\$}256.00$ tent is marked $40\%$ off. Then the store takes another $10\%$ off the sale price. What is the final price?
3. 12
   A $\text{\$}51.00$ pair of shoes is marked $40\%$ off. Then the store takes another $15\%$ off the sale price. What is the final price?

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

1. 13
   Which is the better buy for trail mix: $9$ oz for $\text{\$}4.77$ or $32$ oz for $\text{\$}18.56$?
2. 14
   Which is the better buy for trail mix: $10$ oz for $\text{\$}1.70$ or $27$ oz for $\text{\$}5.40$?

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

1. 15
   Which is the better buy for cereal: $13$ oz for $\text{\$}1.69$, $17$ oz for $\text{\$}2.89$, or $22$ oz for $\text{\$}4.84$?
2. 16
   Which is the better buy for rice: $2$ lb for $\text{\$}0.64$ or $8$ lb for $\text{\$}2.48$?

E.1Compound Interest

1. 1$\text{\$}725.08$
2. 2$\text{\$}848.72$
3. 3$\text{\$}57.70$
4. 4$\text{\$}215.25$

E.2E.3Answer each question.

1. 5$\text{\$}93.00$
2. 6$\text{\$}215.00$
3. 7$\text{\$}141.00$
4. 8$\text{\$}299.00$
5. 9$\text{\$}77.76$
6. 10$\text{\$}104.58$
7. 11$\text{\$}138.24$
8. 12$\text{\$}26.01$

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

1. 13$9$ oz for $\text{\$}4.77$ ($\text{\$}0.53$ per oz)
2. 14$10$ oz for $\text{\$}1.70$ ($\text{\$}0.17$ per oz)
3. 15$13$ oz for $\text{\$}1.69$ ($\text{\$}0.13$ per oz)
4. 16$8$ lb for $\text{\$}2.48$ ($\text{\$}0.31$ per lb)