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4 m = 400 cm
3 m = 300 cm
luas :400x300=120.000cm2
luas ubin =20x20=400
jumlah ubin= 120.000 :400
=300 ubin
1ubin :2500
300 ubin :750.000 <--
luas ubin =20x20=400
jumlah ubin= 120.000 :400
=300 ubin
1ubin :2500
300 ubin :750.000