Wall thickness is 2 cm on all sides, so subtract 4 cm from each outer dimension.<br><br>
Inner length = 80 − 4 = 76 cm<br>
Inner width = 50 − 4 = 46 cm<br>
Inner height = 40 − 4 = 36 cm<br><br>
Inner volume = 76 × 46 × 36<br>
&bull; 76 × 46 = 3,496<br>
&bull; 3,496 × 36 = 125,856 cm&sup3;<br><br>
Final Answer: 125,856 cm&sup3;