12. An engineering start-up borrows $100,000 at 8% compounded annually. The loan is to be repaid in equal annual payments over 30 years. Just after the 8th payment is made, the lender allows the start- up to double the annual payment, and the borrower agrees. If the lender continues to charge 8% compounded annually on the unpaid balance, then how much does the start-up still owe after the 12 payment is made? a. $43,221 b. $73,231 c. $77,281 d. $159,877