Appropriate datatype for holding percent values?

Question

What is the best datatype for holding percent values ranging from 0.00% to 100.00%?

Answer 1

Use numeric(n,n) where n has enough resolution to round to 1.00. For instance:

declare @discount numeric(9,9)
    , @quantity int
select @discount = 0.999999999
    , @quantity = 10000

select convert(money, @discount * @quantity)