The transcript of testimony, if any, and exhibits, together with all papers and requests filed in the proceeding shall constitute the record. All decisions shall become a part of the record and shall include a statement of findings and conclusions, as well as the reasons or basis therefor, upon all the material issues of facts, law or discretion presented and the appropriate order, relief or denial thereof. Notice of any decision shall be mailed or hand delivered to the petitioner, his representative or agent, the Planning Board and the municipal officers within seven days of their decision.