Concord Phone Services offers a cellular phone plan for $52 per month. Under this plan, you can make an unlimited number of phone calls and talk as long as you tike. (a) Prepare a table that shows the cost per minute of airtime and the total anount of the phone bili at the following usage levels: 13 minutes, 104 minutes, 200 minutes, and 520 minutes. (Round unit costs to 2 decimal pleces, es. 52.75.)