John assembles widgets at a factory.  He can make 20 widgets an hour and works for 8 hours a day 5 days a week.  How many widgets does he make a week?
He works 8*5=
<gadget id="calculator">8*5</gadget>
<output>40</output>
40 hours.
So he made 20*40=
<gadget id="calculator">20*40</gadget>
<output>800</output>
800 widgets.

<result>800</result>