Jack operates an accounting practice out of the spare bedroom in his 8-room house. This room is Jack's principal place of business and it is used exclusively for business purposes. Last year, Jack paid $600 for home insurance, $1,400 in utilities, $2,400 in property tax, $5,600 in mortgage principal and $8,900 in mortgage interest. He does not claim capital cost allowance. How much can Jack deduct as a business-use-of-home expense? a) $250.00 b) $550.00 c) $1,662.50 d) $2,362.50