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P = 20 cm
L = 12 cm
L. Perm Balok = 2 (pl + pt + lt)
1568 = 2 (20 x 12 + 20t + 12t)
1568 / 2 = 240 + 32t
784 = 240 + 32t
784 - 240 = 32t
544 = 32t
t = 544/32
= 17 cm
Jadi, tinggi peti tersebut adalah 17 cm
2( 20x12 + 20T + 12T) = 1568
240 + 32T = 784
32T =544
T= 544 / 32
T(tinggi) = 17cm