In a double-pipe heat exchanger used to cool a slurry, the overall coefficient U_i is 1.84 kW/m² · °C. Water flows in the inner pipe, which is 1-in. Schedule 40 steel pipe; the slurry flows in the outer 2-in. pipe. The inside coefficient is estimated to be 4.8 kW/m² · °C based on a published correlation for turbulent flow. 

(a) Calculate the outside coefficient and the percentage of the total resistance in the outside film, the wall, and the inside film. 

(b) If the correlation for h_i has a possible error of ±10 percent and U_i is accurate to only 10 percent, what is the maximum possible error in h_∘?