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+//example 13
+// annual lighting cost of a classroom
+clear
+clc
+p=80 //power consumed by fluoroscent lamp in watt
+n=30 //no. of lamps used
+P=p*n/1000 //lighting power in kW
+t=250*12 //operating hours in a year
+E=P*t //lighting energy/year
+c=E*0.07 //cost of lighting  a classroom for a year in dollars
+printf("\n Hence,annual energy cost of lighting for the classroom is = %.0f $/year. \n",c);
+\ No newline at end of file