Problem: a dishonest dealer professes to sell goods at the cost price but uses a false weight and gains 25 % . find his false weight age ?
Rationale: "25 = e / ( 1000 - e ) * 100 1000 - e = 4 e 1000 = 5 e = > e = 200 1000 - 200 = 800 answer : c"
annotated_formula: subtract(multiply(divide(const_100, 25), multiply(const_100, multiply(add(const_3, const_2), const_2))), const_100)