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The diagram below shows an open rectangular box made up of timber. The external measurement of the box are 30cm, 25cm and 15cm. the thickness of the timber is 2cm.
What is the volume of the timber used to make the box?
A. 4152#cm^3#
B. 2879#cm^3#
C. 7098#cm^3#
D. 11250#cm^3#