In order to hunt hippopotami a hunter must have a hippopotamus hunting license. Since the hunter can sell
the hippopotami he catches to a zoo, he can use the proceeds to pay for part or all of the cost of the license.
If he catches only three hippos, he is still in debt by $2050. If he catches seven hippos, he makes a profit of
$1550. The South African Game and Wildlife Commission allows a limit of ten hippos per hunter. Let "h" be
the number of hippos per hunter. Let "d" be the number of dollars of profit he makes.