To subtract these mixed numbers, we first need to convert each mixed number to an improper fraction.

31 1/5 = $5<em>31+1$/5 = 156/5
43/50 = 43/50
4 1/10 = $10</em>4+1$/10 = 41/10

Now, let's subtract:

156/5 - 43/50 - 41/10
= $156<em>10$/5 - $43</em>2$/100 - $41\ast 5$/10
= 3120/5 - 86/100 - 205/10
= 624 - 0.86 - 20.5
= 603.14

Therefore, $311/5-43/50$ - 4 1/10 = 603.14