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luas : 5 km2
sudah menghasilkan 450 hm2
1 km2 = 1000000 m2
1 hm2 = 10000 m2
maka
5km2 = 5 x 1000000 = 5000000 m2
450 hm2 = 450 x 10000 = 450000 m2
maka kebun yang belum menghasilkan adalah =
5000000 - 450000 = 500000 m2