算法比較多，這裏是簡單的：

來源: 於 2012-07-27 17:22:11 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

house price: P

rent income in a year: L

cost (including management fee, property tax, but no morgage): C

return = (L - C)/P