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40.000 = 2 ( pt + lt) + pl
40.000 = (2 x 120 x 100 + 2 x 100l + 120l)
40.000 = 24.000 + 200l + 120l
40.000 = 24.000 + 320l
320 l = 16.000
l = 16.000/320
l = 50 cm