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b=0.05
c=0.55
P=0.6 * 80 = 48
M=0.6 * 50 = 30
J=0.6 * 100 = 60
W = a*P+b*M+c*J=0.4*48 + 0.05*30 + 0.55*60 = 19.2+1.5+33 = 53.7