1. 2 gros + 2lusin - 12 buah=.....lusin 2.4/1per2 kodi + 10 potong - 1per4 kodi=.....lusin 3.3 lusin + 6 buah - 1per2 lusin=.....lusin 4.2/1per4 rim + 1per2 rim

1. 2 grosir + 2 lusin - 12 buah=(2x144)+(2x12)-12=288+24-12=312-12=300 buah: 12= 25 lusin
2. 4/1per2 kodi +10 potong- 1per4kodi=(4/1per2x20lembar)+(10x12lembar)-(1per4x20lembar)=(40lembar:12)+(120:12)-(5:12)= 3,33+10-0,4=13,29lusin
3. 3 lusin + 6 buah-1per2lusin= 3+(6:12)-1per2=3+0,5-1per2=3lusin
4. 2/1per4 rim+1per2rim-125 lembar=(2/1per4x500)+(1per2rimx500)-125=250+250-125=375 lembar
5. 8 lusin + 2/1per2 lusin + 18 buah=(8x12 buah)+(2/1per2 lusinx12 buah)+18=96+12+18=108+18buah=128buah:12lusin=1,6Gross