a watch was sold at a loss of 10 % . if it was sold for rs . 200 more , there would have been a gain of 4 % . what is the cost price ?
"90 % 104 % - - - - - - - - 14 % - - - - 200 100 % - - - - ? = > rs . 1429 answer : b"
divide(multiply(200, const_100), subtract(add(const_100, 4), subtract(const_100, 10)))