initial commit / add all books

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+clc 
+// Given that
+V = 980 // volume in meter^3
+a1 = 150 // area of wall in m^2
+a2 = 95 // area of ceiling in m^2
+a3 = 90 // area of floor in m^2
+k1 = 0.03 // coefficient of absorption for wall in O.W.U.
+k2 = 0.80 // coefficient of absorption for ceiling in O.W.U.
+k3 = 0.06 // coefficient of absorption for floor in O.W.U.
+// Sample Problem 8 on page no. 8.21
+printf("\n # PROBLEM 8 # \n")
+printf(" Standard formula used \n")
+printf(" T = 0.161 V/a*S \n" )
+A1 = a1 * k1
+A2 = a2 * k2
+A3 = a3 * k3
+A = A1 + A2 + A3
+T = 0.161 * (V / A)
+printf("\n Reverberation time = %f sec",T)