A reduction of 21% 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 from the following choices:
A) s.2.66
B) s.2.4
C) s.2.5
D) s.2.2
E) s.2.1
100*(21/100)= 
<gadget id="calculator">100*(21/100)</gadget>
<output>21</output>
21 --- 10   ? --- 1=&gt; Rs.2.1   100 --- 79   ? --- 2.1 =&gt; Rs.2.66   s.2.66nswer:s.2.66
<result>A</result>
A reduction of 21% in the price of salt enables a lady to obtain 10kgs more for Rs.100, find the original price per kg?