The adjusting entry required on December 31 is:
Debit Insurance Expense = $2,400 and credit Prepaid Insurance = $2,400.
this is how we calculate this;
Amount paid = $4,800
For months of insurance = 4
from 1st November to 31st December 2 months passed, So;
$4,800 x 2/4 = $4,800/ 2 = $2,400.