The cost price of a radio is Rs.2400 and it was sold for Rs.1980, find the loss %? Choose the correct choice from the following answers:
A) 17%	B) 12%	C) 22%	D) 24%	E) 21
2400 ---- 420   100 ---- ? =&gt; 17%   17%nswer:17%
<result>A</result>
The cost price of a radio is Rs.2400 and it was sold for Rs.1980, find the loss %?