Compute Net Income for May Based on the Following Transactions

Compute net income for May based on the following transactions:
May 1 paid $2,200 for May's rent.
May 14 paid $1,200 for two weeks wages.
May 15 performed $5,200 in consulting services on account.
May 17 billed a customer $1,500 for services performed May 16.
May 20 received $5,200 in payment for May 15 transaction.
May 22 performed services and immediately collected $2,000.
May 31 paid $500 for advertising in the local paper to take place in June.

A) $10,200
B) $ 5,300
C) $ 8,700
D) $13,900
E) $ 7,000