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 choice.
A) Rs.2.9 B) Rs.2.1 C) Rs.2.5 D) Rs.2.2 E) Rs.2.7
Explanation:   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: 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?