>Thanks Fabio you reply,
>i am not getting percentage correct
>with out sum result correct but when i use these codes not get corret.
>Can you describe me more

this compute the division, and convert with the two decimal as they are:

TRANSFORM((sum(tobt)/sum(tmax))*100,"##.##") AS PERCENTAGE,;

this compute the division, round the result to two decimal, and convert to char:

TRANSFORM(ROUND((SUM(tobt)/SUM(tmax))*100,2),"##.##") AS PERCENTAGEu;

This is simple and faster, because it round implicitly, but it have a bug and can return wrong values:

STR((SUM(tobt)/SUM(tmax))*100,4,2) AS PERCENTAGEu;

P.S. However, also Round () it is not perfect