Group By on a calculated field using T-SQL -

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i have following code: 

 select distinct m.property_id,     m.property_size,      count(f.request_id) wos,      round(cast(m.[property_size] float(10)) / cast((f.[request_id] * 1000) float(5)),2) per_1k_sqft  t1 m, t2 f m.property_id = f.property_id , datepart(year,request_date) = '2015' , datepart(month, f.request_date) = '12' group  m.property_id, m.property_size, round(cast(m.[property_size] float(10)) / cast((f.[request_id] * 1000) float(5)),2) order count(f.request_id) desc

my last column, per_sq_ft zeros. why isn't populating result of calculation?


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