2004 Fermat Problem 4

A lemon loaf completely fills a pan measuring 20 cm by 18 cm by 5 cm. The loaf is cut into 25 pieces of equal volume. If the density of the loaf is 2 g/cm^3, how much does each of the 25 pieces weigh?

\textbf{(A)}\ 72\ \text{g}\quad \textbf{(B)}\ 288\ \text{g}\quad \textbf{(C)}\ 36\ \text{g}\quad \textbf{(D)}\ 144\ \text{g}\quad \textbf{(E)}\ 720\ \text{g}

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Full credit to this problem is given to the CEMC, you may view all Fermat contests here.