What is in between 2 and 3?
Answer:
hmmmm. probably 2? I think it's two
You work 50 -40 = 10 extra hours per week but get paid for 1.5 times that, or 15 extra hours. In all, you're paid for 40 +15 = 55 hours per week.
.. (55 h/wk)*(4 wk/mo)*($16/h) = $3520/mo
Your gross pay for the month (4 weeks) will be $3,520.
Answer:
All three chose a valid first step toward solving the equation.
All approaches are algebraically correct