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b) Pa=12x
Pb=4x+150
c) Pa=Pb
12x=4x+150
12x-4x=150
8x=150
x=18,75
d) Pa(10)=120
Pa(20)=240
Pa(30)=360
Pa(40)=480
Pa(50)=600
Pb(10)=190
Pb(20)=230
Pb(30)=270
Pb(40)=310
Pb(50)=350
Pb=4x+150
c) Pa=Pb
12x=4x+150
12x-4x=150
8x=150
x=18,75
d) Pa(10)=120
Pa(20)=240
Pa(30)=360
Pa(40)=480
Pa(50)=600
Pb(10)=190
Pb(20)=230
Pb(30)=270
Pb(40)=310
Pb(50)=350