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Verified answer
JawabKue = K
Air = A
5K + 4 A = 30.000 ....kali 2
2K + 6A = 23.000......kali 5
10K + 8 A = 60.000
10K + 30A = 115.000 ......(-)
-22A = -55.000
A = 2.500
2K + 6A = 23.000
2K + 15.000 = 23.000
2K = 8.000
K = 4.000
harus dibayar 3K+ 2A = 3(4.000) + 2(2.500)
= 17.000