A dieting company offers three foods, A, B, and C, and groups its customers into two groups according to their nutritional needs. The following table gives the percent of the daily nutritional requirements that a serving of each food provides and the number of ounces of detrimental substances in each food. Determine the combination of food types that will provide at least 100% of the daily requirements and will minimize the detrimental substances. What is the minimum amount of the detrimental substance?