a 9 real estate agent is consider Changing her cell phone plane There are three Plan to choose from all of which involve monthly serve charge of $20 Plan A has a cost 37 dollar amine for day time calls and 16 minute for evenig calls Plan B t has a charge et 8.46 aminu for evening cells Plan C has a Hat rate & $75 with 300 minutes of calls allowed perna and chare od 8.35 per minute bez or evenine It that day a) Determine the total charge unde eash Plan for this case 130 min of day calls and of evening calls in 50 min a monti Costct for plan A I B B. 22 Z Plan A is optimal from zero s to 7 minute Platec is optimal hom o maudy Obwald A and point o percent daytime minuty