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ukuarn lantai = 2,8 m = 280 cm
3,2 m = 320 cm
ukuran keramik = 40 x 40
maka :
Luas kramik = 40 x 40 = 1.600 cm²
Luas lantai = 280 x 320 = 89.600 cm²
jadi banyak keramik y dibuthkn = 89.600/1.600 = Rp 56 buah