Question

Chris can choose plan a or plan b for his long distance charges. For each plan, cost (in dollars) depends on minutes used (per month) as shown below

Answer 1

Answer:

(The whole question can be seen in the Attachment)

(a) Plan A , $6

(b) 160 minutes, Plan B

Explanation:

(a)

If Chris makes 40 mins of calls for the month, which plan costs less?

In the graph, it can clearly be seen that for 40 mins, Plan A costs $4 while Plan B costs $10. So Plan A costs less.

How much less does it cost than the other plan?

Plan B cost $10 while Plan A costs $4. So Plan A costs $10-$4=$6  less than plan B

(b)

For what number of minutes both plans have the same cost?

We can see from the graph that both plans A and B coincide at 160 mins where the cost of both plans become $16

If the time spent on calls is more than this amount, which plan cost less?

Plan B costs less after time spent on call exceeds 160 mins.