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9m= 900 cm
400 x 900 =360.000 cm
diketahui= keramik= 30 x 30= 900 cm
322 x 900 =289.800
360.000-289.800=70200
70200/ 900= 78
30x30x322=900x322=289.800
360.000-289.800=70.200:900=78 buah