Well if you are looking for the profit margin we need how much is was when she bought it, because it doesn't say, you can't say It's a increase or a decrease, so you could say this is a investment.
But considering you put this under mathematics I assume there is more to this question you forgot to post.
Answer: 2/5
Explanation: 10+8+12 = 30 12/30 = .4 .4 = 2/5
