GROSS RENT MULTIPLIER 有这么计算的吗？

GROSS RENT MULTIPLIER - 从加州房地产 （DRE glossay） copy的。太难相信了：

GROSS RENT MULTIPLIER — A number which, times the gross income of a property, produces an estimate of value of the property. Example — The gross income from an unfurnished apartment building is $200,000 per annum. If an appraiser uses a gross multiplier of 7%, then it is said that based on the gross multiplier the value of the building is $1,400,000.