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+clear;
+clc;
+
+//Example13.17[The R value of a Wall with Rigid Foam]
+//Given:-
+//using values from previous example 
+R_old=2.23;//AS written in book[m^2.degree Celcius/W]
+//R value of of the fibreboard and the foam insulation, respectively
+R_removed=0.23;//[m^2.degree Celcius/W]
+R_added=0.98;//[m^2.degree Celcius/W]
+//Solution:-
+R_new=R_old-R_removed+R_added;//[m^2.degree Celcius/W]
+increase=((R_new-R_old)/R_old)*100;
+disp("m^2.degree Celcius/W",R_old,"Old R value is")
+disp("m^2.degree Celcius/W",R_new,"New R value is")
+disp(increase,"Percent increase in R-value")
+\ No newline at end of file