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 = $
<gadget id="calculator">50+150</gadget>
<output>200</output>
200.
Together with the cake, Tina paid $200+$200 = $
<gadget id="calculator">200+200</gadget>
<output>400</output>
400 for the items.
Since the total percentage for all the items is 100%, the cost of ham and bread is $200/$400 * 100% = 
<gadget id="calculator">200/400*100</gadget>
<output>50</output>
50% of the total cost of items.

<result>50</result>