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 ladder of fixed length \( h \) is to be placed along the wall such that it is free to move along the height of the wall.
Based upon the above information, answer the following questions:
(iii) (b) If the foot of the ladder, whose length is 5 m, is being pulled towards the wall such that the rate of decrease of distance \( y \) is \( 2 \, \text{m/s} \), then at what rate is the height on the wall \( x \) increasing when the foot of the ladder is 3 m away from the wall?