Adiet is to contain at least 2400 units of vitamins, 1800 units of minerals, and 1200 calories. two foods, food a and food b are to be purchased. each unit of food a provides 50 units of vitamins, 30 units of minerals, and 10 calories. each unit of food b provides 20 units of vitamins, 20 units of minerals, and 40 calories. food a costs $2 per unit and food b cost $1 per unit. what is the minimum cost to purchase the food? round your answer to the nearest whole number. do not include a dollar sign or comma in your answer.