\[ \begin{array}{|l|r|r|} \hline \textbf{Particulars} & \textbf{\% of Revenue (2022--23)} & \textbf{\% of Revenue (2021--22)} \\ \hline \text{Revenue from operations} & 100.00\% & 100.00\% \\ \text{Purchase of stock in trade} & 10.00\% & 10.00\% \\ \text{Other expenses} & 1.00\% & 1.00\% \\ \text{Profit before tax} & 89.00\% & 89.00\% \\ \text{Tax (50\%)} & 44.50\% & 44.50\% \\ \text{Profit after tax} & 44.50\% & 44.50\% \\ \hline \end{array} \]
A certain reaction is 50 complete in 20 minutes at 300 K and the same reaction is 50 complete in 5 minutes at 350 K. Calculate the activation energy if it is a first order reaction. Given: \[ R = 8.314 \, \text{J K}^{-1} \, \text{mol}^{-1}, \quad \log 4 = 0.602 \]