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+// Exa 2.2
+// To find usage in call-seconds,CCS(centrum call seconds) and Erlangs).
+
+clc;
+clear all;
+
+Ht=5; //Average holding time in seconds
+PC=450; // Peg count for one hour period
+OC=0;    // Overflow count
+
+// solution
+// usage(Erlangs)=(peg count- overflow count)*Average holding time(in hrs)
+U=(PC-OC)*(5/3600);   
+printf('Usage = %.3f Erlangs = ',U);
+
+// IN CCS
+Uccs=U*36;  // usage in CCS
+printf('%.1f CCS = ',Uccs);
+
+Ucs=Uccs *100;  //usage in call-seconds
+printf('%d call-seconds\n',Ucs);