This is the formula I am trying to do:=SUM(D9:D14)*2.55,    (D16:D23)*3.90,    (D25:D32)*6.40,    (D34:D41)*10.60,     (D43:D46)*10.50,    (D48:D51)*6,    (D53:D59)*3,    (D61:D64)*1.8,(D66:D69)*6I need the sum of each set * different amounts and totaled on one line. What am I doing wrong? 
Can't figure out SUM formula
google spreadsheets