Final answer:
Department One should be charged rent expense for the period of $4,600.
Step-by-step explanation:
To calculate the rent expense for Department One, we need to allocate the cost based on the amount of space occupied by each department.
The total square footage of the space is 10,800 square feet. Department One occupies 2,160 square feet, which is 20% of the total space.
Therefore, Department One should be charged rent expense for the period of $23,000 x 20% = $4,600.