SQL 2012 :: Convert Division Of Int Result Into Decimal

Which one is good method to convert a following division into 2 decimal digits.

q1)

select cast(( cast( sum(population) as decimal) * 100) / sum(totalpopulation) as decimal(7,2)
from
table1 group by state

q2)

select cast(( sum(population) * cast( 100 as decimal)) / sum(totalpopulation) as decimal(7,2)
from
table1 group by state

q3)

select cast( (sum(population) * 100) / cast( sum(totalpopulation) as decimal) as decimal(7,2)
from
table1 group by state

q4)

select cast(( cast(sum(population) as decimal) * 100) / cast( sum(totalpopulation) as decimal) as decimal(7,2)
from
table1 group by state

q5)

select cast( (cast(sum(population) as decimal) * cast(100 as decimal) ) / cast( sum(totalpopulation) as decimal) as decimal(7,2)
from
table1 group by state

q6)

select cast(( cast(sum(population) * 100 as decimal) ) / cast( sum(totalpopulation) as decimal) as decimal(7,2)
from
table1 group by state