a dishonest shopkeeper professes to sell pulses at the cost price , but he uses a false weight of 960 gm . for a kg . his gain is … % .
"his percentage gain is 100 * 40 / 960 as he is gaining 40 units for his purchase of 960 units . so 4.16 % . answer : a"
multiply(subtract(inverse(divide(960, multiply(multiply(add(const_4, const_1), const_2), const_100))), const_1), const_100)