Bridget Ashton is getting ready to open a small restaurant.
She is on a tight budget and must choose between the following long-distance phone plans:

Required

1. Draw a graph of the total monthly costs of the three plans for different levels of monthly long-distance calling.
2. Which plan should Ashton choose if she expects to make 100 minutes of long-distance calls? 240 minutes? 540 minutes?

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Plan A: Pay $0.10 per minute of long-distance calling. Plan B: Pay a fixed monthly fee of $15 for up to 240 long-distance minutes and $0.08 per minute thereaf- ter (if she uses fewer than 240 minutes in any month, she still pays $15 for the month). Plan C: Pay a fixed monthly fee of $22 for up to 510 long-distance minutes and $0.05 per minute thereaf- ter (if she uses fewer than 510 minutes, she still pays $22 for the month).