income: 850x12=10200
expense: 215x12+1323+320=4223
Investment: 68000
收益: (10200-4223)/68000=0.0879=8.79%
案有些美國大地主們的算法,主要是靠貸款買房子收租子的,是按down pay算得:
比如,你有50000貸款,從你錢包裏down pay 18000,mortgage利息每月100刀,則收益為:
expense: 215x12+100x12+1323+320=5423
investment: 18000
收益: (10200-5423)/18000=26.54%