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B2(x) = 85x + 300
a).
B1(100) + B2(100) = 350(100) + 500 + 85(100) + 300
= 35.000 + 500 + 8.500 + 300
= 44.300
b).
B1(100) - B2(100)
= 350(100) + 500 - (85(100) + 300)
= 35.000 + 500 - (8.500 + 300)
= 35.500 - 8.800
= 26.700