পদার্থবিজ্ঞান প্রশ্ন

There are 10 bulbs of 100W, 5 bulbs of 60W and a heater of 3KW in a house. If the lamps are illuminated or 6 hours and the heater is used for 2 hours daily, how many units of electric energy will be used in the month of January in that house?  [P-2.3, IUT : 2021-22]