Răspuns:
4 c......5p......30,45 lei/×5
5c.......4p.......32,55 lei/×4
20c.....25p....152,25 lei
20c......16p....130.2 lei
\c........9p.......22.05lei
22.05÷9=2,45 lei(1 pix)
2,45×5=12,25 lei(5 pixuri)
30,45-12,25=18,2lei(4caiete)
18,2÷4=4,55 lei(1caiet)
2,45×3=7,35 lei 3 pixuri
4,55×3=13,65lei 3 caiete