Output count percentage in 2 decimal places
Are you looking for something like this..

SELECT 
    Deal_type, 
    Price_type, 
    count(isnull(Deal_type, 'x')) * 100 / (
        SELECT count(1) 
        FROM users 
        WHERE Deal_type in ('RMBS','abs', 'cmbs', 'clo', 'cdo') 
    ) as results
FROM [dbo].[all] 
WHERE Deal_type in ('RMBS','abs', 'cmbs', 'clo', 'cdo') 
GROUP BY Deal_type,Price_type 
ORDER BY Deal_type