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volume = p x l x t
240000 = 40 x l x 75
240000 = 3000 x l
l = 240000/3000
l = 80 cm
Lp = 2 ( pxl + pxt + tx )
= 2 ( 40 x 80 + 40 x 75 + 75 x 80)
= 2 ( 12200)
= 24400