Quiz 2.1 Utilities and Budget

Find the cost of a 12 ½ minute phone call using the prices above, which are $0.35 for the first three minutes and $0.19 for each extra minute.

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Rachel’s health-related budget is as follows: The percentage budgeted for health insurance is

four times the percentage for health club dues. The percentage budgeted for prescriptions is

equal to one-fourth the percentage budgeted for health insurance. The percentage budgeted

for doctor’s visits is twice the percentage budgeted for prescriptions. What are the percentages budgeted for all categories?

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Emily’s last water bill listed a previous  reading of 7,123 ccf and a present  

reading of 7,171 ccf. Her water  

company charges $0.73 per ccf of  

water. What should Emily have been  charged on her last water bill?

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Express the cost c(m) of a m-minute phone call at a baseball stadium as a piecewise function using the greatest integer function, given that the stadium charges $0.65 for the first five minutes and $0.22 for each extra minute.

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Celine’s monthly liabilities and assets are given in the table. Determine Celine’s debt-to-income  ratio. Express that ratio as a percent. 

Monthly Liabilities (Debt) Monthly Pre-Tax Assets (Income)

Mortgage Payment 

$2,560 

Gross Salary 

$6,900

Student Loan Payment 

$350 

Income from Rental Property 

$900

Minimum Credit Card Payment 

$50

Car Loan Payment 

$120

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A certain appliance uses w watts to run  If you run it for m minutes, and the cost  per kilowatt-hour is c, the cost of  

running the appliance for m minutes is  given by the formula 

((w(m/60))/1000)(c)  

Find the cost of running an appliance  that requires 500 watts for 25 minutes  at a cost of $0.125 per kWh. Round to  the nearest cent.

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Describe the cost of Call-Tech’s Tell-Cell plan by interpreting the piecewise function provided, which includes a basic charge per month and a charge for each additional minute. The function is defined as follows: f(x) = 40 when x ≤ 750, f(x) = 40 + 0.35(x – 750) when x > 750 and x is an integer, and f(x) = 40 + 0.35(x – 750) + 1 when x > 750 and x is not an integer.

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Kristin’s phone company charges $45 for unlimited texting per month or $0.12 per text message sent or received. For what amount of text messages would the unlimited plan cost the same as the per-text plan?

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