You are the program manager for your organization and you're trying to determine if you...

You are the program manager for your organization and you're trying to determine if you buy or build a software solution for your organization. If you build the solution it'll cost you $75,000 to create and it'll cost you

$12,000 per month to support. If you hire a vendor they can build the solution for $63,000 but their solution will cost you $15,500 per month to support. How many months would you have to use your in-house solution to equate to the cost of the vendor's solution?