A real estate agent is considering changing her cell phone plan; there are three to chose from - all involve a monthly fee of $19.00 Plan A charges $0.37 per minute for daytime calls and $0.19 per minute for evening calls. Plan B charges $0.56 per minute for daytime calls and $0.15 per minute for evening calls. Plan C has a flat rate of $41 with up to 200 minutes of calls included per month and a charge of $0.30 per minute beyond that, day or evening. If the agent will use the service for daytime calls only, how many minutes per month should she stay below so that Plan A is the least cost alternative?