If 5% more is gained by selling an article for Rs. 600 than by selling it for Rs. 580, the cost of the article is?
Choose the most appropriate option:
A) 127
B) 688
C) 400
D) 121
E) 123
Let C.P. be Rs. x.   Then, 5% of x = 600 - 580= 
<gadget id="calculator">600 - 580</gadget>
<output>20</output>
20   x/20= 20 =&gt; x = 400   Answer: 400
<result>C</result>
If 5% more is gained by selling an article for Rs. 600 than by selling it for Rs. 580, the cost of the article is?