A household refrigerator is maintained at a temperature of 35°F. Every time the door is opened, warm material is placed inside, introducing an average of 50 kcal, but making only a small change in the temperature of the refrigerator. The door is opened 15 times a day, and the refrigerator operates at 15\% of the ideal coefficient of performance. The cost of work is 15\textcent/kW h. What is the monthly bill for operating this refrigerator?