Problem: a person bought 135 glass bowls at a rate of rs . 15 per bowl . he sold 115 of them at rs . 18 and the remaining broke . what is the percentage gain for a ?
Rationale: "cp = 135 * 15 = 2025 and sp = 115 * 18 = 2070 gain % = 100 * ( 2070 - 2025 ) / 2025 = 20 / 9 answer : c"
annotated_formula: multiply(divide(subtract(multiply(115, 18), multiply(135, 15)), multiply(135, 15)), const_100)