A watch was sold at a loss of 10%. If it was sold for Rs.140 more, there would have been a gain of 5%. What is the cost price?
Choose the correct choice:
A) s . 933.33
B) s . 1009
C) s . 1007
D) s . 1006
E) s . 1002

Rationale: "explanation : 90 % 105 % - - - - - - - - 15 % - - - - 140 100 % - - - - ? = > rs . 933.33 answer : a"
Answer: A