Once there was a prostitute who had three different rates based on the following three conditions:  

1) $100.00 to do it on the Grass.

2) $200.00 to do it on a Couch.

3) $300.00 to do it in the Bed.  

In the morning a British bloke walks in and slaps a $100 note on the table.

So they went out and did it on the grass.   

 Soon, an American fellow walks in and slaps a $200 note on the table. So they head for the couch and did it there.   

 About the end of the day, a Jamaican man walks in and slaps $300 on the table. Happy from seeing the money the prostitute says, "Wow, you have class".