Answer:
$608.52
Step-by-step explanation:
Ashley's payment total for 3 years is ...
(36 months) × (134.78/month) = $4852.08
Her total for 5 years is ...
(60 months) × (91.01/month) = $5460.60
The difference in these is the difference in interest cost:
$5460.60 -4852.08 = $608.52
When the loan is 5 years, Ashley pays $608.52 more interest.