SELECT with calculated column in SQL Server

Hi!

I have table using function I want get result after multiple amount.

Now I get only one result. I want get list result by using function.

Table: acct

CREATE FUNCTION multiple (
    @acct char(10)
)
RETURNS Decimal(5,2) AS
BEGIN
    DECLARE @result Decimal(5,2);
    SET @result = (select round((amount / 100),2) * 0.03 from acct where account = @acct)

    RETURN @result
END; 

declare @acct int, @counter int, @irr decimal(5,2)

set @counter = 0

while(@counter <= (select count(*) from acct))
begin
    set @acct = (SELECT Account FROM (SELECT ROW_NUMBER() OVER(ORDER BY (SELECT 0)) SiNo, Account FROM acct) t WHERE t.SiNo = @Counter)
    set @irr = dbo.multiple(@acct)--(SELECT Account FROM (SELECT ROW_NUMBER() OVER(ORDER BY (SELECT 0)) SiNo, Account FROM acct) t WHERE t.SiNo = @Counter)
    begin
        print @irr --dbo.multiple(@acct)
    end
    set @counter = @counter + 1
end

I got 0.15 now. Why I can;t get list result?