Final answer:
The relevant monthly cost of purchasing the building is $4,700, which includes mortgage, utilities, property insurance, and maintenance costs.
Step-by-step explanation:
To calculate the relevant cost of purchasing the building, we must add up the monthly mortgage, utilities, property insurance, and maintenance costs. So, the calculation would be:
- Mortgage: $1,800 per month
- Utilities: $1,300 per month
- Property Insurance: $600 per month
- Maintenance: $1,000 per month
Adding these amounts together, we find that the monthly cost of purchasing the building is:
$1,800 (Mortgage) + $1,300 (Utilities) + $600 (Property Insurance) + $1,000 (Maintenance) = $4,700 per month
Therefore, the correct answer is b) $4,700 per month.