The maximum flow rate of a standard shower head is about 3.4 gpm (12.9 l/min) and can be reduced to 2.75 gpm (10.5 l/min) by switching to a low-flow shower head that is equipped with flow controllers. consider a family of four with each person taking a 6-minute shower every morning. city water at 15°c is heated to 55°c in an oil water heater whose efficiency is 65 percent and then tempered to 42°c by cold water at the t-elbow of the shower before being routed to the shower head. the price of heating oil is $2.80/gal and its heating value is 146,300 kj/gal. assuming a constant specific heat of 4.18 kj/kg·°c for water, determine the amount of oil and money saved per year by replacing the standard shower heads by the low-flow ones. (round the final answers to one decimal place.)