3. Cost Benefit Analysis Calculation. 3 points. The property manager of a 30 -unit apartment building is contemplating adding laundry machines to all of the units. Current rent for all apartments is $800/month. The property manager estimates they could increase rents to $815 /month if they had laundry machines. A washeridryer combo costs $850 (including installation). The owner's cap rate is 8% and the apartment building is 90% leased. What is the payback period? What is the increase in property value? Should the property manager recommend this project to the owner? Why