A reat estate agent is considering changing her land Ine phone plas. There are three plans to chooge fromt, all of which itwolve at mentry service charge of $20. Plan A has a cost of 5.45 a minute for dintime cals and $20 a minute for evening cats. Pian 8 has a charge of 5.55 a minute lor daytime cais and $55 a minute for evecing cals. Pan C has a fat rate of $80 with 200 minutes of calt allowed per morth and a charge of 540 per minute beyond that, doy or evening. a. Determine the total charge under esch plan for this case: 120 minutes of day cals and 40 mincees of evenirg calls at a month b. If the agent will crly use the service for ayptime cals, over what tange of call rinutes will esch plan be optimat? (Aound your Answer to the nearest whole numbert c. Supocye that the agert expects both dyyeme and cvening calhs. At whot point fe. percentage of totat call mirutes used for diytitie rounded to 2 decimal places. Omit the "s" 2 ign in your responsed