How do I solve this problem.

Owing to perennial complaints by students and faculty about the lack of parking spaces on campus, a parking garage on university property is being considered. Since there are no university funds available for the project, it will have to pay for itself from parking fees over a 15-year period. A 10% minimum attractive rate of return is deemed reasonable for consideration of the question of how many levels should be constructed. Based on the cost data shown below. determine whether a parking garage should be constructed. If a parking building should be built, how many levels should be built? Use incremental analysis. 1 2 3 4 Number of Levels Construction Costs $600,000 $2,200,000 $3,600,000 $4,800,000 $35,000 $60,000 $80,000 $95,000 Operating Costs S100,000 $350,000 $570,000 $810,000 Yearly Income