Wally Bee purchased a new home for $450,000 with a $50,000 down payment. He financed the remainder with a 3% mortgage for 30 years. If Wally had originally planned on using a 15 year mortgage (also at 3%), how much would Wally save in interest expense compared to the 30 year mortgage? $81,308 $92,658 $109,872 $123,564