It is necessary to insulate an IC, with three different plastic materials, which have different thermal conductivity which are k3=3,k2=1 and k1=0.2, all with British units and ranging from outside in respectively; the established temperatures are T327C and Tamb=24C. An economic investigation yields the following information: Cost (9.3) (isopylation thickness) 24 and Cost =(mmp) useful energy =$1/cal. Calculate the thickness for each layer and to avoid heat loss to the outside. perform your calculations by the economic thickness method. a. 5 in b. 1 in C. 6 in d. 8 in f. 9 in g. 3.5 in h. 3 in i. 2 in j. 5.75 in k. 0.5 in