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
#### 50