|''begin transaction for client''| Bob |''staff''| Pual |
|''rent''|1||Tricycle|''for''|1 day|
|''pay with cash $''|20.00|
|''complete transaction''|

|''total commission''|
|''staff''|''total''|
|Bill|0.00|
|Pual|4.00|
|John|0.00|