850000×60:100=510000 volume de tehnica
850000-510000=340000 rest
340000×30:100=102000 volume de electrotehnica
340000-102000=238000 rest
238000×20:100=47600 volume din domeniul transportului
238000-47600=190400 volume de fizica
Verificare:510000+102000+47600+190400=850000