The difference in dates is 4 months and 5 days. "Ordinary interest" treats each month as 30 days, so the amount of interest charged is

$2000*6.5%*(4*30+5)/360

= $130*125/360

≈ $45.14

$2000*6.5%*(4*30+5)/360

= $130*125/360

≈ $45.14