Adam has $100 and wants to spend it to open a rock stand. He can buy rocks for $5 each and sell them for $7 each. If he invests all his money in the rock stand but only sells 60% of his inventory, how much money does he lose?
He can buy 20 rocks because 100 / 5 = 
<gadget id="calculator">100/5</gadget>
<output>20</output>
20.
He sells 12 of these rocks because 20 x .6 = 
<gadget id="calculator">20*.6</gadget>
<output>12</output>
12.
He makes $84 selling these because 12 x 7 = 
<gadget id="calculator">12*7</gadget>
<output>84</output>
84.
He lost $16 on his business because 100 - 84 = 
<gadget id="calculator">100-84</gadget>
<output>16</output>
16.

<result>16</result>