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+//Chapter-4,Example4_15_8,pg 4-30
+
+l=20                                    //length of room
+
+b=15                                    //bredth of room
+
+h=10                                    //height of room
+
+V=l*b*h                                 //volume of room
+
+a=0.1                                   //absorption coefficient
+
+S=2*(l*b+b*h+h*l)                       //surface area of hall
+
+T1=(0.161*V)/(a*S)                      //Reverberation time,using Sabine's formula
+
+printf("1) Reverberation time =")
+
+disp(T1)
+
+printf("sec")
+
+a2=0.66                                 //absorption coefficient of curtain cloth
+
+S2=100                                  //surface area of a curtain cloth
+
+T2=(0.161*V)/(a*S+a2*S2*2)              //Reverberation time,using Sabine's formula
+
+T=T1-T2                                 //change in Reverberation time
+
+printf("2) change in Reverberation time =")
+
+disp(T)
+
+printf("sec")