-24*29+1240=?  Choose one.
A) -544  B) 584  C) 544  D) 345  E) None of these
=&gt; -24*(30-1)+1240;   =&gt; -(24*30)+24+1240;   =&gt; -720+1264= 
<gadget id="calculator">-720+1264</gadget>
<output>544</output>
544.   544orrect Option: 544
<result>C</result>
-24*29+1240=?