Given that the WVTR of Nylon 6 is 10.6 g mil/(100 in2 day) at 37.8C and 90% RH, and that the saturation water vapor pressure at 37.8C is 49.09 mm Hg, what is the minimum thickness of Nylon 6 required to let no more than 208 grams of water permeate through 1800 in of material in 60 days at 37.8C and 90% RH? State your answer in mils, where 1 mil = 0.001 inch, and show all the steps in detail of your calculations.