Tina buys a loaf of bread for $50, 2oz of ham for $150, and a cake for $200. What percent of the cost is the ham and bread?
The total cost of buying bread and ham was $50+$150 = $200
Together with the cake, Tina paid $200+$200 = $400 for the items
Since the total percentage for all the items is 100%, the cost of ham and bread is $200/$400 * 100% = 50% of the total cost of items.