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x+y = 400.....2
keuntungan = 80x+90y
eliminasi pers 1 dan 2
2x+3y = 1000
2x+2y = 800 (-)
y = 200; maka x = 200
titik uji keuntungan: (200,200), (400,0), dan (0,1000/3)
80x+90y = 80(200)+90(200) = 34000
80x+90y = 80(400) = 32000
80x+90y = 90(1000/3) = 30000
maka keuntungan terbesar adalah 34000
% = (34000/100000).100% = 34%.....opsi C