James buys 6 t-shirts for 50% off.  They each cost $20.  How much did he pay?
Each shirt cost 20*.5=$
<gadget id="calculator">20*.5</gadget>
<output>10</output>
10 with the sale.
So he paid 10*6=$
<gadget id="calculator">10*6</gadget>
<output>60</output>
60.

<result>60</result>