Make sure to answer Parts A, B, and C using the table.

Question

The information on the table is for two pay-as-you-go cell phone companies.

Cell City
Smart Mobile
2.5 hours for $8

​
1/2 hour for $1.75

Part A

What is the unit cost, in dollars, for each company?

(Enter values only; do not enter units)

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SELECTOR TOOL
Select the relevant button to use a function.
(b)

Part B

Show/explain the steps for calculating the unit costs.

Be sure to show work for both Cell City and Smart Mobile.

It is okay to use a calculator to check your work (but still explain the calculations you did).

CELL CITY SMART MOBILE

(c)
Part C

Based on their unit rates, which company offers the best deal?

A
Smart Mobile, because the unit cost is higher.

B
Cell City, because the unit cost is higher.

C
Cell City, because the unit cost is lower.

D
Smart Mobile, because the unit cost is lower.

Answer 1

Part A:

Cell City: $3.20 per hour
Smart Mobile: $3.50 per hour

Part B:
To calculate the unit cost for Cell City, divide the total cost ($8) by the total hours (2.5):

Unit Cost for Cell City = $8 / 2.5 hours = $3.20 per hour

To calculate the unit cost for Smart Mobile, divide the total cost ($1.75) by the total hours (0.5):

Unit Cost for Smart Mobile = $1.75 / 0.5 hours = $3.50 per hour

Part C:
Based on their unit rates, Cell City offers the best deal because its unit cost is lower than Smart Mobile's. Thus, the correct answer is C.