How do I do this?

Farmer Gene is thinking about letting an energy company put up wind turbines on his land. For a single turbine, the energy company will pay Farmer Gene $20,000 up front then an additional $2500 each MONTH to rent the farmer's land. Create an equation for the income, I, Farmer Gene will receive for a single turbine to be put on his land for M months. (Use capital letters) Equation is How much income would Farmer Gene get after 1 year (12 months)? Income would be $ How much income would Farmer Gene get after 15 years? Income would be $ How many months would it take for Farmer Gene to earn an income of $600, 000? It would take months