or duplicated, or posted to a publicly accessible website, in whole or in part.
Name _____________________________________________________________ Date ________________________
© 2011 Cengage Learning. All Rights Reserved. May not be scanned, copied
16. One watt hour is equivalent to 3.413 BTUs per hour.
a. If an air conditioner is rated at 10,000 BTU, how many watts does it require per hour?
Round to the nearest hundred watts.
b. Express your answer to part a in kWh.
c. If you run an air conditioner for 15 hours per day, and electricity costs $0.12 per kWh,
estimate the cost of running the air conditioner for 15 hours on 60 summer days. Round
to the nearest dollar.
17. The following box-and-whisker plot gives the monthly costs of electricity for the
Sharkey household for the year.
$112
$202$166 $325
$398
a. How many months was the bill $202 or less?
b. How many months had bills greater than or equal to $166?
c. If they have gas heat, and they live in Virginia, which month do you think had the
$398 bill? Explain your reasoning.
d. If they have electric heat, and they live in Minnesota, which month do you think had
the $398 bill? Explain.
18. The Lennon family used x dollars worth of electricity two years ago and then switched to
balanced billing.
a. Express the amount of their monthly balanced billing payment algebriacally.
b. Last year, they underpaid their bill and were charged c dollars at the end of the year to
make up for the underpaid charges. Express the amount of this year’s balanced billing
monthly payment algebraically, if it was based on last year’s usage.
19. How many cubic feet are represented by the following water meter?
09
8
7
6
5
4
3
2
101
2
3
4
5
6
7
8
909
8
7
6
5
4
3
2
101
2
3
4
5
6
7
8
9
2,900
2.9
$313
6
9
July or August; the bill was more due to the air conditioning
expenses.
x
__
12
x + c
____
12
508,900
January or February; the bill was more due to the heating expenses.
or duplicated, or posted to a publicly accessible website, in whole or in part.
or duplicated, or posted to a publicly accessible website, in whole or in part.
or duplicated, or posted to a publicly accessible website, in whole or in part.
Name _____________________________________________________________ Date ________________________
or duplicated, or posted to a publicly accessible website, in whole or in part.
Use the following nancial information for Bill Marshall to answer Exercises 4 – 8.
Financial Report
Non-Monthly Expenses
Medical: $300 in June, $160 in October
Auto-related: $1,200 in July
Home-related: $300 in March, $600 in September
Life insurance: $200 in February, June, October
Computer: $3,000 in January
Vacation: $1,200 in August
Gifts: $500 in May, $400 in December
Contributions: $20 each week of the year
Repairs: $1,500 in November
Income
Architect, monthly after-tax income: $8,000
Consultant, monthly after-tax income: $2,000
Monthly Expenses
Rent $2,800 Groceries $220
Car loan $200 Personal loan $300
Electricity $80 Land line phone $40
Sanitation $50 Auto insurance $300
Cable/Internet $100 Savings $600
Dining out $200 College loan $260
Gasoline $180 Cell phone $90
Water $40 Medical insurance $60
Renter’s insurance $50 Entertainment $200
Credit card debt $500
4. The Consumer Credit Counseling Service suggests that the monthly food budget be no
greater than 30% of the income.
a. What is Bill’s total monthly food bill including dining out?
147
© 2011 Cengage Learning. All Rights Reserved. May not be scanned, copied
or duplicated, or posted to a publicly accessible website, in whole or in part. Financial Algebra Workbook 10-4
Name _____________________________________________________________ Date ________________________
149
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or duplicated, or posted to a publicly accessible website, in whole or in part. Financial Algebra Workbook 10-4
(continued from previous page)
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Sanitation
Medical/Dental
Auto-related
Home-related
Vacation
Gi s
Contributions
Repairs
Entertainment
Savings
Debt Reduction
Computer
Other
TOTAL EXPENSES
50 50 50 50 50 50 50 50 50 50 50 50
300 160
1,200
300 600
1,200
500 400
87 87 87 87 87 87 87 87 87 87 87 87
1,500
200 200 200 200 200 200 200 200 200 200 200 200
600 600 600 600 600 600 600 600 600 600 600 600
500 500 500 500 500 500 500 500 500 500 500 500
3,000
5,287 2,287 2,587 2,287 2,787 2,587 3,487 3,487 2,887 2,447 3,787 2,687