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Pp + 3*4/2 = 12/2 = 6j²
Pb = 8*3 + 8*4 + 8*5 = 24 + 32 + 40 = 96j²
Pc = 96+ 2*6 = 108j²
b)
Pp= 2*4= 8
Pb= 2*6*2 + 4*6*2 = 24 + 48 = 72j
Pc= 2*8 + 72 = 16 + 72 = 88j²