Problem 6-39 (LO 6-5) David is a college professor who does some consulting work on the side. He uses 25% of his home exclusively for the consulting practice. He is single and 63 years old. His AGI (without consideration of consulting income) is $41,750. Other information follows: $4,200 1,660 Income from consulting business Consulting expenses other than home office Total costs relating to home: Interest and taxes Utilities Maintenance and repairs Depreciation (business part only) 6,620 1,580 490 1,700 Calculate David's AGI. AGI