Multiple row Subtraction form a single table in SQL

Question

Hi, can any one help me for this sql table....

 

i want to wrire a store procedure where i will pass lookupId   (FK) based on lookup id it will give the requird output... 

here the description.... 

 

id	lookupId	size	rate	buySell
1	1	10	10.5	1
2	1	10	10.5	0
3	1	50	11	1

 

 

 This is my original table .... i have written a quary to get the total based on lookupId and BuySell

(1 = Buy and 0 = Sell) 

 

select lookupId,buySell,

sum(size) as TotalSize ,

sum(size*rate) as TotalPrice

from tblLookupDetails where lookupId=1 group by lookupId,buySell

 

Its gives me this output > 

 

lookupId	buySell	TotalSize	TotalPrice
1	0	10	105
1	1	60	655

 

 But i want Like this output: form a single Quary (Subtraction should be always 1-0 )

 

lookupId	Current Size	Total Amount	Avg
1	50	550	11

 Thank you in advance...