QUOTE (C2Ventures @ Nov 23 2008, 08:47 PM) ROI on house investment = 31.2% (simple interest) based on 25% down payment. 1981 avg home price in Calgary = $114,838 (25% down payment = $28,709.50)2007 avg home price in Calgary = $356,957 (source, Thomas Beyer post on Calgary avg house...