Răspuns:
Explicație pas cu pas:
4 stilouri................2 pixuri......................124 RON
5 stilouri...............3 pixuri........................157 RON
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12 stilouri ..............6 pixuri...................372 RON
10 stilouri ..............6 pixuri...................314 RON
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2 stilouri...........................................372 - 314 = 58 RON
1 stilou................................................58 : 2 = 29 RON
2 pixuri...........124 - 4*29 = 124 - 116 = 8 RON
1 pix...................8 : 2 = 4 RON