For a $72 000 Mortgage at Nine Percent,the Monthly Payments

For a $72 000 mortgage at nine percent,the monthly payments would be $730 for a 15-year mortgage and $579 for a 30-year mortgage.What would be the expected total savings in interest by taking a 15-year mortgage?

A) $27 180
B) $54 360
C) $77 040
D) $131 000