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x+y = 150 x2 = 2x+2y = 300
2x+4y = 420 x1 = 2x+4y = 420
__________ _
-2y = - 120
y = -120/-2
y = 60
x+y = 150
x+40 = 150
x = 150 - 60
x = 90
Tarif = x + y = 90 (1500) + 60 (4000)
= 135000 + 240000
= 375000