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 $0.43 per minute for daytime calls and $0.15 per minute for evening calls.

Plan B charges $0.55 per minute for daytime calls and $0.14 per minute for evening calls.

Plan C has a flat rate of $47 with up to 200 minutes of calls included per month and a charge of $0.32 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?