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maka :
x + y = 90 x2 2x+2y = 180
2x + 4y = 236 x1 2x + 4y = 236
-------------------------- -
-2y = -56
y = 28
x+y = 90
y = 90-28 = 62
jadi uang yang diteriama :
= 1000x+2000y
= 62000+56000
= Rp. 118000,-