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= 6 × 50^2
= 6 x 2500
= 15000 cm2
maka jika lima kubus = 5 × 15000 = 75000 cm2
= 7,5 m2
luas karton = 3 × 2 = 6 m2
ukuran kantor minimal untuk menambah kekurangan karton = 7,5 - 6 = 1,5 m2