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? Choose the correct choice from the following choices:
A) 20 % B) 30 % C) 40 % D) 50 % E) 60 %

Rationale: "selling price / total cost = 1400 / 1000 = 1.4 the gain percent is 40 % . the answer is c ."
Answer: C