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Panjang = 21 m
Lebar = 12 m
Tinggi = 29 m
Luas tiap keramik = 4 dm²
Harga 1 dm² = Rp.10,000
Harga semua keramik...?
Jawab
Luas = panjang x lebar
L = 21 x 12
L = 252 dm²
Banyak keramik = 252 / 4 = 63 buah
Harga = 630,000
Maka harga total pemasangan keramik adalah Rp. 630,000.