In a house hold, 5 tube-light each of 40W are used for 5 hours and and an electric press of 500W is
used for 2 hours and an Air conditioner is used for 10 hours every day. Calculate the cost of using
the tube-lights, electric press and AC for 30 days if cost of electrical energy is five Qatari riyals per
unit.
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Explanation:
5 tube lights 40 w for 5 hours
= 5*40*5 = 1000 watt hours
electric press of 500 w for 2 hours
= 500*2 = 1000 watt hours
wattage of AC is not given, however i calculate the cost for tube lights & electric press
total cost for 30 days
1000 + 1000 = 2000 watt hours
2000*30 = 60000 watt hours
= 60 kilowatt hrs
1 unit = 1 kilowatt hrs
cost for 60 units = 60*5 = 300 qatar riyals
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