Eva just paid a business owner, located near the University, $2,000 for unlimited parking in the business owner's lot. This arrangement saves her $90 per month in parking fees at the University. The agreement Eva made with the business owner is that she can park in the lot until she finishes her Ph.D. If Eva uses a 10% MARR, compounded monthly, on her investments, how many months of parking are required for this to be a good deal for her?