aggregate function on sum and max on 2 table in sql -


i have 2 table invm , invt

invm has 

i_b_no , i_b_dt , freight , tot_amt 1001 , 04/01/2015, 805 , 5000 1002 , 04/01/2015, 205 , 300

invt has 

i_b_no , item_code, item_desc , stax_rate , amount  1001 , xyz     , adlasjdlja,  12.5, 1000  1001  , abc     , dfjsdffsdf,  12.5, 1000  1001  , lkm     , sfkgsfksdn,  10.5, 1000  1001  , rmn     , yeryoueoqe,  5.00, 1000  1001  ,     , qwelskjfsdf,  12.5, 1000 1002   , dad     , sdfkdsffsdf , 10.0, 100 1002   , dekw    , kdasdahdafa , 3.2 , 100 1002    , dasdna , kdfnasldakdf, 6.8 , 100

now want sum ( (freight) * max(staxrate) /100 )

which (805* 12.5)/100 = 1006.25 (205 * 10)/100 = 20.5

ans should 1026.75

i used 

select sum (( sum (invm.freight ) *  max (invt.stax_rate) /100 )) invm inner join invt on invm.i_b_no = invt.i_b_no   invm.i_b_dt between '04/01/2015 00:00:00' , '04/01/2015 00:00:00'  group invm.freight

gives me error

msg 130, level 15, state 1, line 1 cannot perform aggregate function on expression containing aggregate or subquery

.

i stucked in please

do join in derived table group by , max:

select sum (freight * stax_rate / 100) (select invm.freight freight , max(invt.stax_rate) stax_rate       invm inner join invt on invm.i_b_no = invt.i_b_no       invm.i_b_dt between '04/01/2015 00:00:00' , '04/01/2015 00:00:00'       group invm.freight)

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