You are going to select window type and have two alternatives; aluminium and wood. The window size is with/high 1,4/1,8 metres. Following shall be a base:
- Calculation period 60 year, real interest 5%
- Aluminium window
- life time 60 year, maintenance period 20 year(adjustments)
- Wooden window
- life time 30 year (NB when replace an item remember add some costs for removing the old one), maintenance period 5 year (painting)
Set up life cycle diagram for both alternatives and calculate net present value (NPT) and annual cost for the life time (60 years).