Prepare adjusting journal entries for the dog training business for the period ended December 31 . December 31 One month of the 12-month, $3,600 insurance policy is expired by December 31 . This leaves $3,300 not yet expired. December 31 A physical count of supplies on December 31 shows that only $1,200 of supplies remain of the $2,000 supplies purchased. December 31 The $6,000 of equipment purchased at the beginning of December has a useful life of 5 years and will be worth nothing at the end of 5 years ( 60 months). The business uses straight-line depreciation to allocate the $6,000 net cost over 60 months. On December 31, 1 month of depreciation must be recorded. December 31 The business agreed on December 23 to provide a 4-week training service to a customer for a fixed fee of $1,600 paid in advance. By December 31 , the business has provided 1 of the 4 weeks of services and earned one-fourth of the fee. No revenue is yet recorded. \begin{tabular}{|c|c|c|c|} \hline Date & General Journal & Debit & Credit \\ \hline December 31 & & & \\ \hline & & & \\ \hline & & & \\ \hline & & & \\ \hline \end{tabular}