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.

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?

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?

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.

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

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.

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.

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?