In a studio audience of 100 people, 40% of these people have an envelope taped underneath their chairs.  20% of these people will have "You Won" in their envelope, the rest will have empty envelopes.  How many people will win a prize?
40% of the 100 studio audience will have an envelope under their chair so .40*100 = 
<gadget id="calculator">100*.40</gadget>
<output>40</output>
40 people will find an envelope
20% of these 40 people will find a "You Won" notice so only .20*40 = 
<gadget id="calculator">.20*40</gadget>
<output>8</output>
8 people will win.

<result>8</result>