James made $4000 in January.  The next month he made twice as much.  In March, however, James made $2000 less than in February.  How much has James made so far this year?
In February James made 4000 * 2 = 
<gadget id="calculator">4000*2</gadget>
<output>8_000</output>
8000.
In March James made 8000-2000 = 
<gadget id="calculator">8000-2000</gadget>
<output>6_000</output>
6000.
In total for the year James has made 4000 + 8000 + 6000 = $
<gadget id="calculator">4000+8000+6000</gadget>
<output>18_000</output>
18000.

<result>18_000</result>