Market milk, except as provided in Section 35784.2, at the time of delivery to the consumer, shall contain not less than 3.5 percent of milk fat and not less than 8.7 percent of solids not fat. The minimum percentages of milk fats and solids not fat required by this section may vary by an amount no greater than 0.1 of 1 percent, if the total combined percentages of milk fat and solids not fat, at the time of delivery to the consumer, equals or exceeds 12.2 percent.