You are a representative for a cell phone company and it is your job to promote different cell phone plans.

a. your boss asks you to visually display three plans and compare them so you can point out the advantages of each plan to your customers.

•plan a costs a basic fee of $29.95 per month and 10 cents per text message.
• plan b costs a basic fee of $90.20 per month and has unlimited text messages.
•plan c costs a basic fee of $ 49.95 per month and 5 cents per text message.
•all plans offer unlimited calling.
•calling on nights and weekends are free.
• long distance calls are included.

b. a customer wants to know how to decide which plan will save her the most money. determine which plan has the lowest cost given the number of text messages a customer is likely to send.