Răspuns:
raspuns 5400 lei
Explicație pas cu pas:
2 lazi mici -> 2x20sticle=40 de sticle
3 lazi mari -> 3x30sticle=90 de sticle
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390 ron = 40 + 90 de sticle = 130 de sticle
=> o sticla = 3 ron = 390/130
=> marfa totala = 30 lazi x 20 sticle + 40 lazi x 30 de sticle = 600 + 1200 = 1800 de sticle
pret total per 1800 de sticle => 1800 x 3 = 5400 ron
sper ca e corect!