18 x 40 = 720 per week.....720 x 4 = 2880 per month earnings
net pay = 0.72(2880) = 2073.60 <=== cash inflow.
how much he spends per month is his cash outflow.
Mean =12
Standard devation= 3.2863
variance???
Step-by-step explanation:
I think vertical is the correct answer.