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Topi = x
Dasi = y
2x=5y
x=5/2 y
8x+12y=64000
8(5/2 y) +12y=64000
20y+12y=64000
32y=64000
y=64000/32
y=2000
2x=5y
2x=5(2000)
2x=10000
x=10000/2
x=5000
6 buah topi & 20 dasi :
6x+20y
=6(5000)+20(2000)
=30.000+40.000
=70.000 (C)