Internal edge =1m
Thickness of wood=5cm
External length=1m+10cm=1.1
Breadth =1m+10cm=1.1
Height =1m+5cm=1.05
Volume of the wood =outer-inner volume
=1.1*1.1*1.05-1*1*1
=1.2705-1.0000
=0.2705m3
Cost of wood 1m3=Rs9600
So,cost of 0.2705m3=9600*0.2705 =Rs2596.80
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