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= 22/7 × 21/2 × 20
= 660 cm² => 6,6 m²
=> 50 topi = 6,6 m² × 50 => 330 m²
=> biaya minimal = Rp. 40.000 × 330 m² => Rp. 132.000
jadi biaya min tersebut adalah 132.000 (d)
#semoga membantu ya#