Answer:
Long-term fixed-rate plan-$220,320.00
Short-term variable-rate plan-$224,280.00
The long-term fixed-rate plan is less costly as it has a lower interest expense
Step-by-step explanation:
Total interest under the first plan=principal amount*interest rate*3 years
principal amount is $720,000
interest rate is 10.20%
total interest expense=$720,000*10.20%*3=$220,320.00
Interest expense under second plan=($720,000*8.50%)+($720,000*12.90%)+($720,000*9.75%)=$224,280.00