The city pool loses 1.0 inch of water every week due to evaporation. If the pool is 25 yards long and 12 yards wide, what is the energy required to keep the pool at 15C. If the cost of energy is $0.10 per kW.hr, would it be worth purchasing a $1600 pool cover that reduces evaporation to 15% of that for an uncovered pool over a 4-month season? How long will it take to recover the purchase price? [14.8 x 10 Btu per week; 4.32 weeks]