Rhono apparently works 5*3+5 = 20 hours per week. His net pay for 4 weeks* is
.. 4*20*8.75*(1 -0.20) = $560
The listed expenses add to
.. 35 +21 +18 +24 +15.75 = 113.75
The amount left over at the end of each 4-week period is
.. $560 -113.75 = $446.25
If he saves the remainder, after 12 months, he will have saved
.. 12*$446.25 = $5,355.00
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* There are 13 periods of 4 weeks in a year. If Rhono takes no vacation, his savings balance may be $560 more than the above amount, that is, $5,915.00.