上面这个speadsheet有点问题，看这个

Annual return rate for W M Condo Purchasing
Monthly Payment		$                1,400		Rental		$         1,800
# of Month		300		# of Month		300
Amount Paid		$             420,000
Principal		$              50,000
Estimated Closing Cost		$              12,500
Total Payment		$             482,500		Total Rental Income		$     540,000
Total Reutrn		$              57,500
Total Reutrn Rate		12%
Annual Return Rate		0.5%