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+//Example 6_33 page no:368
+clc;
+//given
+lumen = 1000000;//in lumen-hours
+power = 100;//in W
+voltage = 230;//in V
+voltage2 = 210;//in V
+cost = 3;//in rupees
+life = 1000;//in hours
+enf_cost = 5;//in paise
+lumen_output = 1160;
+//sol
+//210V lamps
+no_of_hrs = lumen / lumen_output;
+cost_of_lamp = no_of_hrs * cost / life;
+cost_of_eng = no_of_hrs * power * enf_cost / ( power *life);
+tot_cost = cost_of_eng + cost_of_lamp;
+//230V lamps operating at 210V
+lumen_output = 810;
+life = 2750;
+power = 87.5;
+no_of_hrs = lumen / lumen_output;
+cost_of_lamp = no_of_hrs * cost / life;
+cost_of_eng = no_of_hrs * power * enf_cost / ( 100 *1000);
+total_cost = cost_of_eng + cost_of_lamp;
+disp(tot_cost,"the total cost of 210V lamps is (in rupees)");
+disp(total_cost,"the total cost of 230V lamps is (in rupees)");
+disp("230V lamps are 2% cheaper than 210V lamps");