(a) Within 20 days of the date of the initial decision, either party may appeal the decision to the President of DFC. The President's decision on such appeal shall be based solely on the record of the proceedings or those portions thereof cited by the parties to limit the issues.(b) If the President modifies or reverses the examiner's decision, the President shall specify such findings of fact and conclusions of law as are different from those of the examiner.(c) The decision of the President on appeal, shall constitute final administrative decision. An initial decision of the examiner which has not been appealed during the 20-day period provided shall become a final administrative decision on the twenty-first day.