Problem: Mr. Carlos Rodríguez, has some savings in a corporation financial, fruit of his work as commercial director at ABC Company, which recognizes 25% annual cash. You want to buy a taxi with your savings, with the following conditions: $3,000,000 initial installment and 30 overdue monthly installments of $300,000. Mr. Rodríguez estimates that the taxi will produce $400,000 per month and he hopes to sell it at the end of three years for $10,000,000. Is it good business?