This in what I got:
(-7i)(10i)
-70i
For 300 more square feet the rent is $150 more.
Rent per additional square foot is 150/300 or 0.50.
For an additional 400 square feet the rent is an additional 400(0.50) or $200.
The rent for 1500 feet squared office is $1325.
Answer:

Step-by-step explanation:
Take a look at the attachment...
Hope this helps! :)
The answer to the problem is B.