Răspuns :
850000:100x60=510000 tehnica
850000-510000=340000
340000:100x30=102000 electrotehnica
340000-102000=238000
238000:100x20=47600 transport
2380000-47600=190400 fizica
850000-510000=340000
340000:100x30=102000 electrotehnica
340000-102000=238000
238000:100x20=47600 transport
2380000-47600=190400 fizica
60%din 850000= 60/100*850000= 510000
850000-51000= 340000(restul)
30% din 340000= 30/100•34000= 102000
340000-102000= 238000 restul
20% din 238000=20/100•238000= 47600
238000-47600= 190400(cărți de fizică)