sandy buys an old scooter for $ 800 and spends $ 200 on its repairs . if sandy sells the scooter for $ 1200 , what is the gain percent ?
selling price / total cost = 1200 / 1000 = 1.2 the gain percent is 20 % . the answer is c .
multiply(divide(subtract(1200, add(200, 800)), add(200, 800)), const_100)