92. A refrigerator is maintained at a
temperature of 2oC. Each time the door is
opened, 420 kJ of heat is introduced
inside the refrigerator, without changing
the temperature of the refrigerator. The
door is opened 20 times a day and the
refrigerator operate at 15% of the ideal
COP. The cost of work is Rs. 2.50 kW-hr.
Determine the monthly bill for this
refrigerator if the atmosphere is at 30oC.

c. 118.80