For the services of commissioners or officers under any decree for a sale, including the collection and paying over of the proceeds, there may be allowed a commission of five percent on amounts up to and including $100,000, and two percent on all amounts above $100,000. If the sale is made by one commissioner or officer and the proceeds collected by another, the court under whose decree they acted shall apportion the commission between them as may be just. For the purposes of this section, each piece of property so sold shall constitute a separate sale, even though more than one piece of property is sold under the same decree.