Something like this should get you started.
select
WeekEndDate,
floor(((DATEDIFF(dd, dateadd(mm, datediff(mm, 0, WeekEndDate), 0), WeekEndDate) + 1) / 7.0) * SUM(PlanItemsSold)) as PlanItemsSold,
floor(((DATEDIFF(dd, dateadd(mm, datediff(mm, 0, WeekEndDate), 0), WeekEndDate) + 1) / 7.0) * SUM(ActualItemsSold)) as ActualItemsSold
from #MyTable
group by WeekEndDate
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