If A got 80 marks and B got 40 marks, then what percent of A's mark is B's mark?  Choices:
A) A)60%
B) B)80%
C) C)50%
D) D)75%
E) of these
A's marks = 80 ; B's marks = 40.   Let x% of A = B =&gt; x/100 * 80 = 40   =&gt; x = (40 * 100)/80= 
<gadget id="calculator">(40 * 100)/80</gadget>
<output>50</output>
50   B's marks is 50% of A's marks.   ANSWER:50%
<result>C</result>
If A got 80 marks and B got 40 marks, then what percent of A's mark is B's mark?