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Yeah, because I (apart from the Perl script) only helped you to solve this problem:
# but I want to check if file is .java or .c++ not a simple file (-f), I don't know how to do it..

The part...

awk '{split($(NF-1),a,"/");b[a[3]]+=$(NF-2)}END{for(i in b) print i,"$"b[i]}' file
2006 $14000
2007 $23400
2008 $98000
2009 $42000

This is only for cost per year.

Start with this:

awk -F"[. ]" '{t[$11]+=$15}END{for(i in t) printf "%s %s\n",i,t[i]}' infile

awk '/^TK/{print $2,$3;c+=$5}{a[$7]+=$5}END{x="Total cost ";print x" for TK is "c ORS;for (i in a){print i"\t" x" per model "a[i]}}' file