A reduction of 20% in the price of salt enables a lady to obtain 4 kgs more for Rs.100, find the original price per kg? Options:
A) 6.16	B) 6.21	C) 6.25	D) 2.4	E) 2.7
100*(20/100)= 
<gadget id="calculator">100*(20/100)</gadget>
<output>20</output>
20 --- 4   ? --- 1=&gt; Rs.5   100 --- 80   ? --- 5 =&gt; Rs.6.25   Answer: 6.25
<result>C</result>
A reduction of 20% in the price of salt enables a lady to obtain 4 kgs more for Rs.100, find the original price per kg?