A seller uses 840gm in place of 1kg to sell his goods. Find his actual % profit or loss, when he sells his article his article on 4% gain on cost price?  Choose the correct choice from the following answers.
A) 23 17/21%
B) 25%
C) 27 25/37%
D) 30%
E) 32%
Selling price of 840gm = 100+4= 
<gadget id="calculator">100+4</gadget>
<output>104</output>
$104   Profit= 104-84= 
<gadget id="calculator">104-84</gadget>
<output>20</output>
$20   % of profit= 20*100/84 = 23 17/21 %   23 17/21%nswer is 23 17/21%
<result>A</result>
A seller uses 840gm in place of 1kg to sell his goods. Find his actual % profit or loss, when he sells his article his article on 4% gain on cost price?