sandy buys an old scooter for $ 800 and spends $ 200 on its repairs . if sandy sells the scooter for $ 1400 , what is the gain percent ?
"selling price / total cost = 1400 / 1000 = 1.4 the gain percent is 40 % . the answer is c ."
multiply(divide(subtract(1400, add(200, 800)), add(200, 800)), const_100)