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?	Pick one
A) 3.7	B) 2.8	C) 2.5	D) 4.7	E) 2.7
2.5   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
<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?