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panjang rusuk = 12 m
biaya pengecetan = 15.000/m²
yang akan di cat = dinding = 4 sisi
maka :
Luas y dicat = 4 x sisi²
= 4 x 12²
= 576 cm²
jadi biaya pengecetan = 576 x 15.000 = Rp 8.640.000