Final answer:
The total interest for the 7% financing option for 30 years will be $605,640, while the total interest for the 7.5% financing option for 25 years will be $440,300.
Step-by-step explanation:
To calculate the total interest for each choice, we need to find the remaining balance of the office building after the down payment and then calculate the interest for each financing option.
a) For the 7% financing option for 30 years:
The remaining balance after the down payment is $988,000 - ($988,000 x 0.10) = $988,000 - $98,800 = $889,200.
Using the formula for calculating the total interest on a loan, Total Interest = (Principal x Rate x Time) - Principal:
Total Interest = ($889,200 x 0.07 x 30) - $889,200 = $1,494,840 - $889,200 = $605,640.
b) For the 7.5% financing option for 25 years:
The remaining balance after the down payment is the same, $889,200.
Using the same formula, Total Interest = ($889,200 x 0.075 x 25) - $889,200 = $1,329,500 - $889,200 = $440,300.
Therefore, the total interest for each choice is:
a) 7% for 30 years: $605,640
b) 7.5% for 25 years: $440,300
So, the correct answer is a) 7% for 30 years.