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U + E = 60
U = 60 - E
50U + 20E = 1.500
50(60 - E) + 20E = 1.500
-(50-20)E = 1.500 - 3.000
-30E = -1.500
E = -1.500/-30
E = 50
U = 60-50 = 10
pendapatan maksimum = 500.000U + 300.000E
= 10x500.000 + 50x300.000
= 5.000.000 + 15.000.000
= Rp. 20.000.000 untuk sekali penerbangan