Explanation:
it just means that you save 50% (half) of the money you have left after deducting your expenses.
now, there is a little problem with the problem description (please send my regards to your teacher), as a month is usually a little bit longer than 2×2 weeks.
if this was defined that way on purpose, then we need to do a whole year calculation of 12 months and 52 weeks and then cut the result back to 1/12 (a month) of the year.
otherwise we would simply calculate 1 month with 2×2 weeks.
so, I will do it twice here : one for the precise annual calculation, and one for the rough monthly calculation.
you need to pick from these two approaches what you actual need.
1. precise annual calculation :
the annual (12 months) income is
12 × $3,167.89 = $38,014.68
the annual deductions (52/2 = 26 times) are
26 × $954.32 = $24,812.32
the amount of money left at your disposal is then
$38,014.68 - $24,812.32 = $13,202.36
half (50%) of that is
13,202.36/2 = $6,601.18
so, you are saving over the course of a whole year
$6,601.18.
that is per month
6,601.18/12 = $550.0983333... ≈ $550.10
2. rough monthly calculation (1 month, 2×2 weeks) :
your income = $3,167.89 per month.
your deductions per month = 2×954.32 = $1,908.64.
that means you have left every month
3,167.89 - 1,908.64 = $1,259.25
half (50%) of that you save, which is
1,259.25/2 = $629.625 ≈ $629.63
you see the difference between the precise and the rough calculation.
I would use 1. because of the strange problem definition.
but you know better what your teacher wants.