Each of the following independent events requires a year end adjusting entry. Record each event and the related adjusting entry in general journal format. The first event is recorded as an example. Assume a December 31 closing date.
a. Paid $30,000 cash in advance on September 1 for a one-year lease on office space.
b. Purchased $4,000 of supplies on account on April 15. At year-end, $300 of supplies remained on hand.
c. Received a $7,200 cash advance on July 1 for a contract to provide services for one year beginning immediately.
d. Paid $10,200 cash in advance on February 1 for a one-year insurance policy.