SQL & PL/SQL

Hi , I have this code :

select     i.INVESTOR_CODE , 
i.investor_name , 
sum(invoice_commission) as commission ,
sum(INVOICE_SUBTOTAL) as total   <<<<
from investor i , invoice inv
where INVOICE_DATE  between  '01-JAN-08' and '31-DEC-08'
and i.INVESTOR_CODE = inv.INVESTOR_CODE
group by i.INVESTOR_CODE , i.investor_name
order by total;

Can someone PLEASE re-write this query so it can get the top 100 investor with the highest "total"

Thanks....