An IC needs to be insulated, with three different plastic materials, which have different thermal conductivity which are ka-3, k-1 and k = 0.2, all with British units and going from outside to inside respectively; the set temperatures are 13-27C and Tamb=24C. An economic investigation yields the following information: review 2 3 5 Flag the flag the question 8 10 Cost (mmp) = (9.3) (insulation thickness) and Cost mmp)=1/3+1.5/3 (total thickness) and Cost of useful energy = $1/cal. Finish attempt Calculate the thickness for each layer and to avoid heat loss to the outside. Make your calculations by the economic thickness method.