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5a+30b=410.000 x2
2a+60b=740.000 x1
10a+60b=820.000
2a+60b=740.000 -
8a=80.000
a= 10.000
5(10.000)+30b=410.000
50.000+30b=410.000
30b=360.000
b=12.000
harga 2kg gula dan 5 kg beras= 2(10.000) + 5(12.000)= 20.000+60.000= 80.000