Calculate income that is partially affected by a plugged delay.
For example, say I have an apartment complex with 10 one bedrooms and 15 two bedrooms the one bedrooms currently bring in 100 a month per unit and the two bedrooms currently bring in 200 a month.
Once I have renovated one of the one bedroom units will bring in 150 a month in income but it will take me x number of months to renovate it during which time I won't make any money on that unit.
Once I have renovated one of the two bedroom units it will bring me 175 in income each month but it will take me xx number of months to renovate it during which time I won't make any money on that unit.
How do I calculate how much money I make each month including income on the renovated - any down units + units that haven't been renovated yet.