Hypothesize why the reward for Pap is only $200 and the reward for Jim is $300 given that Pap is suspected as Huck's killer.
It shows what was important during that time. People found it more important to find an escaped slave who has a slight chance of being the murderer rather than find the drunk who most likely killed Huck. Slaves were very important to the people of this time. If a slave ran away, a massive search party is sent out. When Pap disappears, no one goes looking for him.