Definition: You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
Input: Question: Sandy buys an old scooter for $900 and spends $300 on its repairs. If Sandy sells the scooter for $1320, what is the gain percent?

 Option A: 2%

 Option B: 4%

 Option C: 6%

 Option D: 8%

 Option E: 10%

Option E