A dietician has two foods with which to prepare a diet containing at least 400 units of calcium, 175 units of iron, and 280 units of vitamin A. The table below gives the units of calcium, iron,
and vitamin A per ounce for the two foods.
FOOD I FOOD II
CALCIUM1220
IRON1412
VITAMIN A1025
Food I costs 35 cents an ounce and Food II costs 42 cents an ounce. What combination of the
two foods gives the diet, meeting the above requirements, of minimum costs?