The following transactions occurred for M Co. in December.

• Owner invested $10000 into the business
• Paid salaries = $4500
• Purchased office supplies on account $1650
• Paid business registration expense $450
• Prepaid 6 months rent = $6000
• Received $250 utility invoice that is payable on Jan 10
• Borrowed $25000 from local bank
• December credit sales = $9000

What is the Net Income for December? (enter value without "$" or "," )