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maka = (20+1) m x (10+1) m = 21 m x 11 m = 231 m^2
luas II
maka = 20 m x 10 m = 200 m^2
maka utk cari harga ubin2
(231-200) x 60.000
31 x 60.000
1.860.000 (A)