The cost C, in dollars, of a prepaid cell phone call is proportional to the time t, in minutes, that the call lasts. The equation that represents this relationship for Carrier A is C = 0.15t. The table below shows the relationship for Carrier B. Which carrier has a lower unit rate?
Time
(minutes)
2
5
10
30
Cost
(dollars)
0.24
0.60
1.20
3.60
A
Carrier A
B
Carrier B
С
Both carriers have the same rate
D
The relationship cannot be determined