Sheffield Phone Services offers a cellular phone plan for $60 per month. Under this plan, you can make an unlimited number of phone calls and talk as long as you like.

(a) Prepare a table that shows the cost per minute of airtime and the total amount of the phone bill at the following usage levels: 20 minutes, 130 minutes, 292 minutes, and 598 minutes. (Round unit costs to 2 decimal places, e.g. 52.75.)

a. 52.25.) (b) What typa ot cost bahavor cas Shetids phone plan lustrate?Wh Ths a beauze totail minutas used Increraes. c Assu e that your o rrer t cel phone pl r tus youU O2 per minute vou use 1,140 minu es o ar rme per month wn lan wou d you pre e ou per month or so. 2 per m ure what' you used 3,300 menutes per month? A hat eve o artime sage o d nu become indif erent between the tw L,L40 minute: 002 per minute 3,366 minuts 0 per month Inciffcrentat minutc: minutes used