A reduction of 20% in the price of salt enables a lady to obtain 10kgs more for Rs.100, find the original price per kg?  Select.
A) 2 3/2 B) 2 2/3 C) 2.5 D) 3 E) 1
100*(20/100)= 
<gadget id="calculator">100*(20/100)</gadget>
<output>20</output>
20 --- 10   ? --- 1=&gt; Rs.2   100 --- 80   ? --- 2 =&gt; Rs.2.5   ANSWER:2.5
<result>C</result>
A reduction of 20% in the price of salt enables a lady to obtain 10kgs more for Rs.100, find the original price per kg?