an office assistant who earns $10.00 an hour was paid $120.00 for 10 hours of work. How is this possible?

It's possible if the worker is paid "double time" after 8 hrs.

So

$10 for 8 hours + $20 for 2 hrs. =

$80 + $40  =

$120

well considering taxes take a big cut of your money, he was slipped a few bills