Interest on capital is calculated as: \[ \text{Interest on Capital} = \text{Capital Amount} \times \text{Rate of Interest}. \] Assume Vivek's capital is ₹3,80,000, and the rate of interest is 15% per annum: \[ \text{Interest on Capital} = ₹3,80,000 \times 15% = ₹57,000. \] Thus, the correct answer is (C).
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: \[ R = 8.314 \, \text{J K}^{-1} \, \text{mol}^{-1}, \quad \log 4 = 0.602 \]