You use an old cell phone for calls only and you have two options, buy a monthly plan or pay as you go. The phone plan costs $50 per month and calls...

1. You use an old cell phone for calls only and you have two options, buy a monthly plan or pay as you go. The phone plan costs $50 per month and calls are free up to 8 hours. Any extra minute for that month will cost you $0.25. Pay as you go has a flat rate of $0.15 per minute. (i) What are the two total costs if you plan to talk for 9 hours? Please, (ii) draw a single graph that shows the two options and clearly label the relevant points and ranges, (iii) and build a spreadsheet table that shows the same in table form. (iv) How should the fixed cost of the plan change so that the pay as you go option is always more convenient? (v) Considering only the cell phone plan with the $50 fixed cost and a 15-hour maximum talk time per month, optimize the average cost per minute with a method of your choice among a graph, an enumerative spreadsheet table or Excel Solver, along with a detailed explanation.

1. You use an old cell phone for calls only and you have two options, buy a monthly plan or pay as yougo. The phone plan costs $50 per month and calls are free up to 8 hours. Any extra minute for...