The diagram shows rectangle $$\(A B C D\)$$ with rectangle $$\(E F G H\)$$ cut out to form the shaded region. Diagram NOT accurately drawn $$\(A D=8.3 \mathrm{~cm}\)$$ correct to one decimal place $$\(D C=7.2 \mathrm{~cm}\)$$ correct to one decimal place $$\(E H=6.2 \mathrm{~cm}\)$$ correct to one decimal place $$\(H G=5.3 \mathrm{~cm}\)$$ correct to one decimal place Work out the upper bound of the area of the shaded region. Show your working clearly. $$\(\mathrm{cm}^{2}\)$$

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