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3jaket + 2 topi = 380000 |4| 12 jket + 8 topi = 1520000
= 7topi = 280000
= 1 topi = 40000
3 jaket + 2*40000=380000
3 jket + 80000=380000
1 jket= 100000
jadi 1 jket + 3 topi = 100000+ 120000= 220000
3x+2y=380000~×4
12x+15y=1800000
12x+8y=1520000
---------------------------- --
7y =280000
y =40000
3x+2y=380000
3x+2(40000)=380000
3x+80000=380000
3x=380000-80000
3x=300000
x=100000
x+3y
100000+3(40000)
100000+120000
220000