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1 kg duku = d
eliminasikan
(1) 2m+3d=85000 | .1 → 2m+3d = 85000
(2) 1m+3d=75000 | .2 → 2m+6d= 150000
------------------------- (-)
0 + (-3d) = -65000
d = 21666,66 ( masa uang kok pecahan, mungkin soalnya salah) d = 21700 ( hasil pembulatan)
subtitusikan pers 2
1m+3d = 75000
1m+65100 =75000
m =9900
Harga 5 manggis dan 5 duku
5(Rp9900)+5(Rp21700)
=Rp49500+Rp108500
=Rp158000