The cost price of a radio is Rs.1900 and it was sold for Rs.1330, find the loss %?  Choose the correct choice from the following choices:
A) 18 %
B) 31 %
C) 30 %
D) 45 %
E) 12 %

Rationale: "1900 - - - - 570 100 - - - - ? = > 30 % answer : c"
Answer: C