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luas lantai = 27 m^2
kramik yg dibutuhkan = 27 : 0,09 = 300 kramik
jml dus yg dibutuhkan = 300 : 10 = 30 dus
1 dus = 10 keramik -> 10 x 0,09 = 0,9
Dus keramik yg dibutuhkan = 27 : 0,9 = 30 dus