A 1 m x 1.25 m hot surface at 300 C is to be cooled by attaching a rectangular fins (k = 200 W/m K) with 30 mm length, 75 mm width and 5 mm base thickness. Fins are exposed to an ambient air condition of 25C and heat transfer coefficient is 30 W/m K. If there are 2250 fins, calculate; The heat transfer rate from a single fin. %3D b. The increase in the rate of heat transfer. c. Determine the overall effectiveness of the fins. .