A reduction of 20% in the price of salt enables a lady to obtain 10kgs more for Rs.600, find the original price per kg?
Choose the most appropriate option:  A) s.11  B) s.14  C) s.15  D) s.21  E) s.29
100*(20/100)= 
<gadget id="calculator">100*(20/100)</gadget>
<output>20</output>
20 --- 10   ? --- 1=&gt; Rs.2   600 --- 80   ? --- 2 =&gt; Rs.15   Answer:s.15
<result>C</result>
A reduction of 20% in the price of salt enables a lady to obtain 10kgs more for Rs.600, find the original price per kg?