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2x +3y = 110.000 <×2> 4x +6y = 220.000
-------------------------- -
y = 20.000
2x + 3y = 110.000 ket. x = compact disk
2x + (3×20.000) = 110.000 y = kaset
2x+ 60.000 = 110.000
2x = 110.000-60.000
2x = 50.000
x = 50.000 ÷ 2 = 25.000
jadi, 6x + 5y
( 6×25.000) + (5×20.000)
150.000 + 100.000
= Rp. 250.000,00