486—4.72 (10A,88) Rules of evidence. Hearings before the employment appeal board or administrative law judge shall be in accordance with these rules and insofar as practicable shall be governed by the rules of evidence applicable in the Iowa district courts. A finding shall be based upon the kind of evidence on which reasonably prudent persons are accustomed to rely for their serious affairs, and it may be based upon such evidence even if it would not be admissible in a jury trial.