We know that
• The principal is $7,100.
,
• The interest rate is 5.5%.
,
• The time is 60 days.
We have to use the simple interest formula

(a) The amount of interest would be $64.20.
(b) The total amount that must be paid after 60 days is $7,164.20.
Because it's the sum of the principal plus the interest.