Greensboro Properties Inc. owns a building in which it leases office space to small businesses and professionals. During the year, Greensboro Properties engaged in the following transactions:

a$.$ On March $1,$ Greensboro Properties paid $$10,560$ in advance to Patterson Insurance Company for $1$ year of insurance beginning March $1.$ The full amount of the prepayment was debited to prepaid insurance.

b$.$ On May $1,$ Greensboro Properties received $$33,600$ for $1$ year$$s rent from Angela Cottrell, a lawyer and new tenant. Greensboro Properties credited unearned rent revenue for the full amount collected from Cottrell.

c$.$ On July $31,$ Greensboro Properties received $$276,000$ for $6$ months$$ rent on an office building that is occupied by Newnan and Calhoun, a regional accounting firm. The rental period begins on August $1.$ The full amount received was credited to unearned rent revenue.

d$.$ On November $1,$ Greensboro Properties paid $$3,000$ to Pinkerton Security for $3$ months$$ security services beginning on that date. The entire amount was debited to prepaid security services.