Answer:
$2,000
Explanation:
The total rent for the building is $30,000. If the space in the first floor is considered twice as valuable as the space in the first floor, it means that rent for the first floor is $20,000, while rent for the second floor is $10,000.
If we are charged $20,000 for 100,000 square feet, it means that each square feet costs $0.2. ($20,000 / 100,000 square feet).
Now, we simply multiply that figure by the area of the deparment store:
$0.2 x 4,000 square feet = $2,000
Thus, the monthly rental space for the department store should be $2,000