A reduction of 20% in the price of salt enables a lady to obtain 10kgs more for Rs.200, find the original price per kg? Options:
A) s.7  B) s.4  C) s.5  D) s.1  E) s.9
100*(20/100)= 
<gadget id="calculator">100*(20/100)</gadget>
<output>20</output>
20 --- 10   ? --- 1=&gt; Rs.2   200 --- 80   ? --- 2 =&gt; Rs.5   Answer:s.5
<result>C</result>
A reduction of 20% in the price of salt enables a lady to obtain 10kgs more for Rs.200, find the original price per kg?