A watch was sold at a loss of 20%. If it was sold for Rs.520more, there would have been a gain of 6%. What is the cost price? Select the correct option:
A) Rs.1500 B) Rs.2000 C) Rs.3000 D) Rs.4200 E) Rs.2500
80%   106%   --------   26% ---- 520   100% ---- ? =&gt; Rs.2000   Answer:Rs.2000
<result>B</result>
A watch was sold at a loss of 20%. If it was sold for Rs.520more, there would have been a gain of 6%. What is the cost price?