Chris would earn 5200 - 5200 / 10 = 5200 - 520 = $<<5200-5200/10=4680>>4680 from the first buyer.
He would earn 5200 - 80 - 80 * 3 = 5200 - 80 * 4 = 5200 - 320 = $<<5200-80-80*3=4880>>4880 from the second buyer.
The difference between Chris’s earnings would be 4880 - 4680 = $<<4880-4680=200>>200.
#### 200