Using monthly calculations based on weather conditions of Denver, Colorado, determine the annual evaporative losses from a 4,000-ft2 outdoor swimming pool with water temperature kept at 80°F throughout the year. Determine the cost-effectiveness of a cover if the pool is operated on average 10 hours per day and 250 days per year. The cost of a cover is $1.50/ft2. Assume a gas-fired boiler is used to heat the water at a cost of $2/gallon and a boiler efficiency of 85 percent.