Four loan balances are $6,500, $3,600, $5,400, and $7,500, respectively. the current interest rates for the loans are 7%, 5%, 6%, and 9%, respectively. if the four are to be consolidated into one loan, what is the weighted average interest rate on that loan? a) 6.75% b) 7.01% c) 7.04% d) 7.10%