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?  Choose the correct option
A) 2.9 B) 2.6 C) 2.5 D) 2.4 E) 2.1
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?