Answer: The extension lift should b bought as it incurs a lesser cost during the 6 years period.
Step-by-step explanation:
If lift is retained:
Operating expense = 23800 × 6 = 142800
Repair cost = 37000
Total cost = 142800 + 37000 = 179800
If lift is purchased:
Rental revenue if earned = 9000 × 6 = 54000
New machine cost = 156500
Sale of old machine = 23000
Check explanation for attachment