Can anyone help me with this?

[Hyperion]

This is the last one I'm putting. It's up to you guys if you want to take the trouble of reading and solving it. :)
Ugh, it's probably too wordy...solve only if you have nothing to do whatsoever.

The infamous band Slippery Even When Dry ended their concert and checked into the Fuzzy Fig Motel. The guys in the band (Spike, Slip, and Milly) decided to share a room. They were told by Chip, the night clerk who was taking a home study course on animal husbandry, that the room cost $25 for the night.
Milly, who took care of the finances, collected $10 from each band member and gave chip $30. Chip handed Milly the change, $5 in single. Milly, knowing how bad Slip and Spike were at arithmetic, pocketed two of the dollars, turned to the others, and said, "Well guys, we got $3 change, so we each get a buck back." He then gave each of the other two members a dollar and pocketed the lsat one for himself.
Once the band members left the office, Chip, who witnessed this little piece of deception, suddenly realized that something strange had just happened. Each of the three and members first put in $10 so there was a total of $30 at the start. Then Milly gave each guy and himself $1 back. That means that each person put in only $9, which is a total of $27 ($9 from each of the three). But Milly had skimmed off $2, so that gives a total of $29. But there was $30 to start with. Chip wondered what happened to that extra dollar and who had it. Can you please resolve and explain the issue to Chip?