Chapter 7 Study Guide
Use the percent equation to answer the question.
1. 18 is 30% of what number?
2. What percent of 25 is 7?
3. What number is 21% of 300?
4. Ken correctly answered 27 questions on a science test. He received a score of 75%. How many questions were
on the test?
5. Luis makes a 4% commission on his sales in a sporting goods store. For a $70 purchase, how much commission
does Luis earn?
6. Jeff is a salesperson in a retail store and earns $95 per week plus 5% of his weekly sales. If Jeff made $680 one
week, what were his sales that week?
Identify the percent of change as an increase or a decrease. Then find the percent of change. Round your
answer to the nearest tenth if necessary.
7. Original: 236
New: 223
8. Original: 32
New: 34
9. Original: 276
New: 296
10. Tell whether the change is an increase or decrease. Then find the percent of change. Round your answer to the
nearest tenth if necessary.
Original: 91
New: 86.45
Use the given information to find the new amount.
11. Original price: $19.61
Markup percent: 60%
12. Use the given information to find the original price.
Retail price: $540
Markup percent: 125%
13. A department store purchases a coat for $60. To sell the coat to customers, the price is increased by 17%. What
is the new price of the coat?
14. You have $40.00. You wish to buy a T-shirt costing $14.50 and a pair of jeans costing $23.95. There is a 5%
sales tax on clothing. Do you have enough money to pay for both?
15. You have $40.00. You wish to buy a T-shirt costing $14.50 and a pair of jeans costing $23.95. There is a 4%
sales tax on clothing. Do you have enough money to pay for both?
16. A man buys 7 shirts at $22.84 each. There is also a 4% sales tax. Find his total bill. Use a calculator.
17. The sales tax rate in a certain state is 8%. Find the total price paid for a pair of shoes that costs $44.
Use the simple interest formula to find the unknown quantity.
18.
$60
$1600
7.5%
?
For an account that earns interest compounded annually, find the balance of the account.
19.
20. Find the simple interest earned on $800 invested at 5.5% for 6 months.
Chapter 7 Study Guide
Answer Section
1. ANS:
60
PTS: 1
DIF: Level A
KEY: percent equation | find the base
2. ANS:
28%
REF: MLC20461
BLM: Knowledge
TOP: Lesson 7.4 The Percent Equation
NOT: 978-0-618-79813-1
PTS: 1
DIF: Level A
KEY: percent equation | find the percent
3. ANS:
63
REF: MLC20463
BLM: Knowledge
TOP: Lesson 7.4 The Percent Equation
NOT: 978-0-618-79813-1
PTS: 1
DIF: Level A
KEY: percent equation | find the amount
4. ANS:
36
REF: MLPA0312
BLM: Knowledge
TOP: Lesson 7.4 The Percent Equation
NOT: 978-0-618-79813-1
PTS: 1
DIF: Level B
REF: AXG70506
KEY: word | percent equation | find the base
NOT: 978-0-618-79813-1
5. ANS:
$2.80
TOP: Lesson 7.4 The Percent Equation
BLM: Knowledge
PTS: 1
DIF: Level A
KEY: word | commission
6. ANS:
$11700
REF: MMT30219
BLM: Knowledge
TOP: Lesson 7.4 The Percent Equation
NOT: 978-0-618-79813-1
PTS: 1
DIF: Level B
KEY: word | commission
NOT: 978-0-618-79813-1
7. ANS:
decrease, 5.5%
REF: DJBF0718
TOP: Lesson 7.4 The Percent Equation
BLM: Comprehension
PTS: 1
DIF: Level A
REF: MLPA0318 TOP: Lesson 7.5 Percent of Change
KEY: percent of increase | percent of decrease | percent of change
BLM: Comprehension
NOT: 978-0-618-79813-1
8. ANS:
increase, 6.3%
PTS: 1
DIF: Level A
REF: MLPA0319 TOP: Lesson 7.5 Percent of Change
KEY: percent of increase | percent of decrease | percent of change
BLM: Comprehension
NOT: 978-0-618-79813-1
9. ANS:
increase, 7.2%
PTS: 1
DIF: Level A
REF: MLPA0320 TOP: Lesson 7.5 Percent of Change
KEY: percent of increase | percent of decrease | percent of change
BLM: Comprehension
NOT: 978-0-618-79813-1
10. ANS:
decrease, 5%
PTS: 1
DIF: Level A
REF: MLPA0314 TOP: Lesson 7.5 Percent of Change
KEY: percent of increase | percent of decrease | percent of change
BLM: Comprehension
NOT: 978-0-618-79813-1
11. ANS:
$31.38
PTS: 1
DIF: Level B
KEY: markup | finding new amount
12. ANS:
$240
REF: MLPA0324
BLM: Knowledge
TOP: Lesson 7.6 Percent Applications
NOT: 978-0-618-79813-1
PTS: 1
DIF: Level B
REF: MLPA0327
KEY: markup | retail price | find original price
NOT: 978-0-618-79813-1
13. ANS:
$70.20
TOP: Lesson 7.6 Percent Applications
BLM: Comprehension
PTS: 1
DIF: Level B
KEY: word | markup | find retail price
NOT: 978-0-618-79813-1
14. ANS:
No
REF: AMPA0062 TOP: Lesson 7.6 Percent Applications
BLM: Comprehension
PTS: 1
DIF: Level B
KEY: word | sales tax
NOT: 978-0-618-79813-1
15. ANS:
Yes
REF: M1AH0026 TOP: Lesson 7.6 Percent Applications
BLM: Comprehension
PTS: 1
DIF: Level B
REF: M1AH0027
NAT: NCTM 6-8.NOP.1.c | NCTM 6-8.PRS.2 | NCTM 6-8.PRS.1 | NCTM 6-8.CON.3
STA: OK.PASS.MTH.02.6-8.1.1 | OK.PASS.MTH.02.6-8.1.2 | OK.PASS.MTH.02.6-8.4.1 |
OK.PASS.MTH.02.6-8.5.4 | OK.PASS.MTH.02.8.2.1.b | OK.PASS.MTH.02.8.4.1
TOP: Lesson 7.6 Percent Applications
KEY: word | sales tax
BLM: Comprehension
NOT: 978-0-618-79813-1
16. ANS:
$166.28
PTS: 1
DIF: Level B
REF: M1AH0030
NAT: NCTM 6-8.CON.3 | NCTM 6-8.NOP.1.c | NCTM 6-8.PRS.1 | NCTM 6-8.PRS.2
STA: OK.PASS.MTH.02.6-8.1.1 | OK.PASS.MTH.02.6-8.1.2 | OK.PASS.MTH.02.6-8.4.1 |
OK.PASS.MTH.02.6-8.5.4 | OK.PASS.MTH.02.8.2.1.b | OK.PASS.MTH.02.8.4.1
TOP: Lesson 7.6 Percent Applications
KEY: sales tax | total bill | use a calculator
BLM: Knowledge
17. ANS:
$47.52
NOT: 978-0-618-79813-1
PTS: 1
DIF: Level B
KEY: sales tax | total price
18. ANS:
6 months
REF: MHA10180
BLM: Knowledge
PTS: 1
DIF: Level A
REF: MLPA0332
TOP: Lesson 7.7 Simple and Compound Interest
BLM: Knowledge NOT: 978-0-618-79813-1
19. ANS:
$442.86
PTS: 1
DIF: Level A
REF: MLPA0335
TOP: Lesson 7.7 Simple and Compound Interest
BLM: Knowledge NOT: 978-0-618-79813-1
20. ANS:
$22
PTS: 1
DIF: Level A
REF: MLC20912
TOP: Lesson 7.7 Simple and Compound Interest
BLM: Knowledge NOT: 978-0-618-79813-1
TOP: Lesson 7.6 Percent Applications
NOT: 978-0-618-79813-1
KEY: simple interest
KEY: compound interest
KEY: simple interest