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k= 2(p+l)
240= 2 x (2l + l)
240= 2 x 3l
3l = 120
l = 120:3
l = 40
k= 2p + 2l
240= 2p + (2x40)
240 = 2p +80
2p = 160
p = 80
v= pxlxt
v= 80x40x8
v=25600