Section 357F.15 - Determination of fee1. The owner of any property joining an established district shall pay to the trustees of the district an initial fee to be computed as follows: a. The trustees shall first determine fair market value of all property and improvements owned by the district, less any indebtedness.b. The board shall then determine the assessed value of all property in the district which is not assessed as agricultural land. This shall be divided into the value determined in paragraph "a".c. The board shall determine the assessed value of the property of each landowner joining the established district which is not assessed as agricultural land.d. The result obtained in paragraph "b" shall be multiplied by the result obtained in paragraph "c". The result shall be the initial fee to be charged each landowner.2. The initial fees paid to the trustees shall be used to help defray the cost and maintenance of the district's emergency medical services.