John plants a plot of 3 trees by 4 trees.  Each tree gives 5 apples.  He sells each apple for $.5.  How much money does he make, in dollars?
He has 3*4=
<gadget id="calculator">3*4</gadget>
<output>12</output>
12 trees.
So he has 12*5=
<gadget id="calculator">12*5</gadget>
<output>60</output>
60 apples.
So he sells the apples for 60*.5=$
<gadget id="calculator">60*.5</gadget>
<output>30</output>
30.

<result>30</result>