user: Elizabeth uses $3.00 worth of ingredients to make a  bag of granola.  She makes 20 bags and sells them for $6.00 a bag at the farmer's market.  An hour before closing, she has sold 15 bags and marks the remaining 5 bags down to $4.00 and sells them soon after.  What is her net profit? Let's think step by step and output the final answer after "####".
Answer: 50