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?
She uses $3.00 of ingredients per 1 bag of granola and she makes 20 bags so she spends 3*20 = $<<3*20=60.00>>60.00 on ingredients
She sells 15 bags for $6.00 so she makes 15*6 = $<<15*6=90.00>>90.00
She sells her last 5 bags for $4.00 so she makes 5*4 = $<<5*4=20.00>>20.00
She made $90.00 and $20.00 for a total of 90+20 = $<<90+20=110.00>>110.00
She made $110.00 but spent $60.00 on ingredients so her net profit is 110-60 = $<<110-60=50.00>>50.00
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