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15.000 - 10.000= 5.000 maka uang coki 5.000 rupiah
misal x jumlah seluruh uang, maka
a=2/10x
b=3/10x
c=5/10x
a=15000
15000=2/10x
150000=2x
x=75000
c=5/10x
c=5/10(75000)
c=1/2(75000)
c=37500