John and his two brothers decide to split the cost of an apartment.  It is 40% more expensive than John's old apartment which costs $1200 per month.  How much does John save per year by splitting the apartment compared to living alone?
His old apartment cost 1200*12=$
<gadget id="calculator">1200*12</gadget>
<output>14_400</output>
14,400 per year.
His new apartment 1200*1.4=$
<gadget id="calculator">1200*1.4</gadget>
<output>1_680</output>
1680 per month.
That means it cost 1680/3=$
<gadget id="calculator">1680/3</gadget>
<output>560</output>
560 per month.
So it cost 560*12=$
<gadget id="calculator">560*12</gadget>
<output>6_720</output>
6720.
So he saves 14400-6720=$
<gadget id="calculator">14400-6720</gadget>
<output>7_680</output>
7680.

<result>7_680</result>