Hearing and decision

1. At such hearing, the appellants and any other interested person may appear and be heard. The appeal board shall examine, with the aid of competent assistants, the entire record, and if it shall find that the form of contract is suitable for the improvement proposed, that the improvement and the method of providing for payment therefor is for the best interests of the municipality and the taxpayers therein, and that such improvements can be made within the estimates therefor, it shall approve the same. Otherwise, it may reject the same as a whole or, it shall recommend such modifications of the plans, specifications, or contract, as in its judgment shall be for the public benefit, and if such modifications are so made, it shall approve the same. 2. The appeal board shall certify its decision to the body proposing to enter into such contract unless it shall have rejected the same as a whole, whereupon the municipality shall advertise for bids and let the contract subject to the approval of the appeal board which shall at once render its final decision thereon and transmit the same to the municipality.