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= 3 x 3
= 9
biaya untuk alas = 9 x 20.000
= 180.000
L dinding = 4 x luas segitiga
= 4 x 1/2 x a x t
= 2 x 3 x 2,5
= 15
biaya untuk dinding = 15 x 25.000
= 375.000
biaya keseluruhan = 180.000 + 375.000 + 80.000
= 635.000