How to get total at the bottom of the pivot chart for calculated dimension

[#1]

I have a calculated dimension FTE i need to get Total at the bottom of the pivot chart ? i have used aggregation function could any one of you suggest me how do i get total for calculated dimension?

Department		FTE	Hours	Client
Management		20	10	9
Creative		30	25	50.25
Media		28	30	-
Operations		260.29	22	26
Planning		40.64	12	-
Technology		91.82	13	225.5
Total			112	310.75