2-19 VARIABLE COSTS, FIXED COSTS, TOTAL COSTS. Ana Compo is getting ready to open a small restaurant. She is on a tight budget and must choose between the following long-distance phone plans:

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Plan A: Pay 10 cents per minute of long-distance calling.

Plan B: Pay a fixed monthly fee of $16 for up to 300 long-distance minutes, and 5 cents per minute thereafter (if she uses fewer than 300 minutes in any month, she still pays $16 for the month).

Plan C: Pay a fixed monthly fee of $20 for up to 480 long-distance minutes and 4 cents per minute thereafter (if she uses fewer than 480 minutes, she still pays $20 for the month).