December $31$ One month of the $12-$month, $$4,500$ insurance policy is expired by December $31.$ This leaves $$4,125$ not yet expired.

December $31$ A physical count of supplies on December $31$ shows that only $$1,275$ of supplies remain of the $$2,150$ supplies purchased. December $31$ The $$7,800$ of equipment purchased at the beginning of December has a useful life of $5$ years and will be worth nothing at the end of $5$ years $(60$ months$).$ The business uses straight$-1$ine depreciation to allocate the $$7,800$ 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 $$1,900$ 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.

December $31$ On December $31,$ wages of $$675$ are owed to a part$-$time employce for work done over the past $3$ weeks. Those wages are not yet paid or recorded.

December $31$ The business agreed to provide $6$ weeks of training services to a customer for a fee of $$4,650,$ or $$775$ per week. The customer agrees to pay the full $$4,650$ at the end of $6$ weeks when services are complete. By December $31,2$ weeks of services have been provided, but the business has not yet billed the customer or recorded the $2$ weeks of services provided.