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+clc;clear;
+//Example 2.13
+
+//given values
+Plamp=80;
+N=30;//no of lamps
+t=12;
+y=250;//days in a year
+UC=0.07;//unit cost in USD
+
+//calculation
+LP=Plamp * N/1000;//Lighting power in kW
+OpHrs=t*y;//Operating hours
+LE=LP * OpHrs;//Lighting energy in kW
+LC=LE*UC;//Lighting cost
+disp(LC ,'the annual energy cost in USD is ')