heres how it works:
You earn 1 point for every 15 minutes that you are installing something.
Lets take a h/u for example. Circuit city has determined that a h/u takes 1.5 hours to install, therefore it is worth 6 points. Similarly, an amplifier takes 3 hours, so 12 points.
So If you work an 8-hour day, you have to earn 32 points to meet your expected labor percentage for that day. If you install enough stuff to earn 36 points, you made 105% of your expected productivity. If you do that all month long, and you end up at 105% for the month, and the team ends up at 95% or above, you get a bonus.