Calculate the percentage gain if a trader bought a bicycle for Rs.640 and sold it for Rs.720? Pick:  A) 14.5%  B) 11.5%  C) 15.5%  D) 12.5%  E) 18.5%
C.P. = 640   S.P. = 720   Gain = 720-640 ---- 80   % Gain =&gt; 80/640*100= 
<gadget id="calculator">80/640*100</gadget>
<output>25/2 = around 12.5</output>
&gt; 12.5%   Answer:12.5%
<result>D</result>
Calculate the percentage gain if a trader bought a bicycle for Rs.640 and sold it for Rs.720?