Answer:
The corerct answer is A. 7.17%.
One way to solve the problem would be the following:
First step: Calculate the interests on each loan.
First National Bank: $1,500,000 * 6% = $90,000
Banner Bank: $1,000,000 * 9% = $90,000
Western National Bank: $500,000 * 7% = $35,000
Second step: Sum all the interests.
$90,000 + $90,000 + $35,000 = $215,000
Third step: Use a simple rule of three to determine the weighted average cost of capital.
r = ($215,000 * 100%)/$3,000,000 = 7.17%