John reels in 3 crab baskets a week.  Each basket holds 4 crabs.  He collects crabs twice a week.  Each crab sells for $3.  How much money does he make?
He collects 3*4=
<gadget id="calculator">3*4</gadget>
<output>12</output>
12 crabs each time.
He thus collects 12*2=
<gadget id="calculator">12*2</gadget>
<output>24</output>
24 crabs a week.
So he makes 24*3=$
<gadget id="calculator">24*3</gadget>
<output>72</output>
72 a week.

<result>72</result>