Your local cell phone company offers you a choice of billing plans:

Plan A: Pay 5 cents per call.

Plan B: Pay an initial $2.00 a week, which allows you up to 30 calls per week at no charge. Any additional call over 30 costs 5 cents per call.

Plan C: Pay an initial $4.00 a week, which allows you up to 80 calls per week at no charge. Any additional call over 80 costs 4 cents per call.

If your budget for keeping in touch is $12 per week, graph your budget constraints under the three plans. ( label the budget constraint for each plan properly)

Rank the three plans in order of preferences.