During each marketing season and not later than July 1, the commissioner shall estimate a budget that includes contributions and assessments necessary for the administration and enforcement of this order and for carrying on duly authorized programs and activities including marketing, and product research and informational services as hereinbefore provided. The commissioner shall announce rates of assessment to provide adequate funds to defray expenditures in the budget. The rate of assessment shall not exceed four cents per hundred pounds of apples or 16 mils (.016) per bushel of apples sold for processing, juice or fresh market use. The total amount of budgeted administrative cost shall not exceed five percent of the total budget.