A reduction of 20% in the price of salt enables a lady to obtain 10kgs more for Rs.500, find the original price per kg?	Choose the most appropriate option:
A) s.12.7  B) s.12.4  C) s.12.5  D) s.12.1  E) s.12.9
100*(20/100)= 
<gadget id="calculator">100*(20/100)</gadget>
<output>20</output>
20 --- 10   ? --- 1=&gt; Rs.2   500 --- 80   ? --- 2 =&gt; Rs.12.5   Answer:s.12.5
<result>C</result>
A reduction of 20% in the price of salt enables a lady to obtain 10kgs more for Rs.500, find the original price per kg?