Question 1183048
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This problem is good to develop your common sense,  instead of  (and rather than)  making formal exercises.



From the problem's description,   the hourly earning rate is  120/8 = 15 dollars per hour.



After that,  you can easily answer all other/remained questions.




                                REMEMBER and MEMORIZE it: 


            all these formal exercises in this problem are worth  NOTHING.




It is only &nbsp;<U>BAD &nbsp;EDUCATIONAL &nbsp;system/conception</U> &nbsp;may allow/produce such teaching as questions in this problem . . .