SET @rn=1;
SELECT
    '' AS `Price`, /* A */
    p.weight AS `Weight`, /* B */
    p.cost AS `Cost`, /* C */
    CONCAT('=IFERROR(ROUND(A', @rn, ' - C', @rn, '), 2), 0)') AS `Profit $`, /* D */
    CONCAT('=IFERROR((D', @rn, '/C', @rn, ')*100, 0)') AS `Profit %`, /* E */
    @rn:=@rn+1 AS `Row`
FROM
    products p
WHERE
    p.avail > 0