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+// Exa 2.12
+// To calculate number of mobile subscribers supported for the given system.
+
+clc;
+clear all;
+
+channels=50;
+blocking=0.02;
+HT=120;//average holding time inm sec
+BHcall=1.2;// in calls  per hour
+
+//solution
+//Refering Erlang B table in appendix A, For 50 channels at 2% blocking, the offered load=40.26 Erlangs.
+A=40.26;
+B=A*(1-0.02); //carried load
+Avgtraffic_user=BHcall*HT/3600;
+No_users=B/Avgtraffic_user;
+printf('NO of mobile subscribers supported are %d \n',round(No_users));