Hello there,
best way to do this one is set up your story line....
4h + 8h + 50 = 164$...
let's make this easier to look at and combine like terms..
12h + 50 = 164$...
Beautiful!!! Now let's try and get the h alone?...
minus 50 to both sides...
12h = 114$..
now divide both sides by 12...
H= 9.50$/hour
Looks like you made 9.50$ an hour but Hey, at least you got that bonus ;)