Sorry, I don't see any room for misunderstanding. There are three columns. The first lists the number of travelers referred - 1-3, 4-7, 8. The next column lists the award amounts for each traveler referred - $100, $200, $4,000 plus. The last column lists the totals. So if someone referred two travelers, the award would be $200. If someone referred four travelers, the award would be $800. Etc.
What's not to understand?