I developed a SSRS tabular report using below query
select Department,
CONVERT(DECIMAL(10,2), sum(si.GrossPrice) / 100.0) gross
from SaleItem si, Sale sa
where GrossPrice != 0 and sa.SaleID = si.SaleID
and sa.StartDate between '2015-01-03 04:00:01' and '2015-08-04 04:00:00'
group by Department
order by Department
and it give the o/p like below screen
Now I need to show the grand total of the amount. How can I do it. I done grouping of the items in first column then include sub total but that give me subtotal after each line of the item. I need grand total of entire amount. I am new to SSRS.