Any grower or dealer who fails to make collection or to file return or to pay any assessment within the time required pursuant to this act shall thereby forfeit to the commission a penalty of five per cent (5%) of the amount of the assessment determined to be due, as provided in this act, plus one per cent (1%) of such amount for each month of delay or fraction thereof after the expiration of the first month after such return was required to be filed or such assessment became due. The commission, if satisfied that the delay was excusable, may remit all or any part of such penalty. Such penalty shall be paid to the commission and disposed of as provided with respect to moneys derived from the assessments levied and imposed by this act.