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25. The purchase price of a Machine \( A \) is \( Rs 0000 \). Its salvage rates \& maintenance costs are as follows. Determine the optimal age of replacement \begin{tabular}{|c|c|c|c|c|c|} \hline Age(years) & 1 & 2 & 3 & 4 & 5 \\ \hline Salvage rate (Rs) & \( 5 \sqrt{2}-500 \) & 4000 & 3000 & 2000 & 1000 \\ \hline Maintenance cost(Rs) & 600 & 800 & 1000 & 1400 & 2000 \\ \hline\( C \) C \end{tabular}

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