From the 200 meat pies, Du Chin makes 200*$20 = $<<200*20=4000>>4000 after the sales.
The amount of money he uses to buy ingredients to make pies for sale on the next day is 3/5*$4000 = $<<3/5*4000=2400>>2400
After setting aside money for buying ingredients, Du Chin remains with $4000-$2400 = $<<4000-2400=1600>>1600
#### 1600