Returner decimal fra udregning med inner select

Jeg vil gerne regne forskellen mellem de to inner selects i procent. Problemer med følgende er at den kun returnere et helt tal, f.eks. 200 selvom det burde være 252,12.

Jeg har prøvet med CAST(xx AS float) på flere måder, men uden held.

Nogle ideer? :)

SELECT 
    Track.TrackID,
    Track.TrackName,

(
    (CAST(
        (
            ISNULL((SELECT SUM(TrackStatistics.UniquePlays + TrackStatistics.UniqueDownloads)
                FROM TrackStatistics
                WHERE TrackStatistics.TrackID = Track.TrackID
                AND DATEDIFF(dd, @StatDate, TrackStatistics.StatisticsDate) BETWEEN 1 AND 7), 0)
        -
            ISNULL((SELECT SUM(TrackStatistics.UniquePlays + TrackStatistics.UniqueDownloads)
                FROM TrackStatistics
                WHERE TrackStatistics.TrackID = Track.TrackID
                AND DATEDIFF(dd, @StatDate, TrackStatistics.StatisticsDate) BETWEEN 8 AND 14), 0)
        )

        /
            NULLIF((SELECT SUM(TrackStatistics.UniquePlays + TrackStatistics.UniqueDownloads)
                FROM TrackStatistics
                WHERE TrackStatistics.TrackID = Track.TrackID
                AND DATEDIFF(dd, @StatDate, TrackStatistics.StatisticsDate) BETWEEN 8 AND 14), 0)

    AS float))
    * 100
) AS ChangePct

FROM       
    Track

WHERE   
    Track.Active = 1

ORDER BY
    ChangePctDESC