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topi=y
(4x+5y=600.000)x2
(3x+2y=380.000)x5
(8x+10y=1.200.000)-(15x+10y=1.900.000)
-7x=-700.000
x=100.000
----------------------------
(4x+5y=600.000)x3
(3x+2y=380.000)x4
(12x15y=1.800.000)-(12x+8y=1.520.000)
7y=280.000
y=40.000
----------------------------
x+3y=...
100.000+3(40.000)= 100.000+120.000=Rp220.000