Question 23 (18 points) A real estate agent is considering changing her cell phone plan. There are two plans to choose from. Plan A has a cost of $0.40 a minute for daytime calls and $0.18 a minute for evening calls. Plan B has a flat rate of $80 with 275 minutes of calls allowed per month and a charge of $0.35 per minute beyond that day or evening. a) If the agent will use 150 minutes of day calls and 70 minutes of evening calls in a month. What would be the total cost of Plan A ? and and What would be the total cost of plan B? A/ If the agent will use the service for daytime calls only, over what range of call minutes will each plan be optimal? Plan A is optimal from zero to minutes. Plan B is optimal from A minutes onward