A finned surface consists of root or base area of 1m and fin surface area of 2m. The average heat transfer coefficient for finned surface is 20W/m2K effectiveness of fins provided is 0.75. If finned surface with surface with root or base temperature of 50C is transferring heat to fluid of 30C, then the rate of heat transfer without using fin is _______

A) 400W B) 800W
C) 1000W D) 1200W

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