A cell phone plan has a monthly cost that is shown in the table below. What is the correct statement regarding the average rate of change during the 40-minute time of talk?
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Total minutes of talk time /Monthly cost of cell phone
A)The average rate of change is $0.50, meaning that for each minute of talk time, the monthly bill increases by $0.50.
B)The average rate of change is $0.50, meaning that for every ten minutes of talk time, the bill increases by $0.50.
C)The average rate of change is $0.05, meaning that for each minute of talk time, the monthly bill increases by $0.05.
D)The average rate of change is $0.05, meaning that for every ten minutes of talk time, the bill increases by $0.05.