=+1-23.

A Btu-meter is a device that measures water flow rate and the temperature difference between the water entering and leaving the property of an energy customer. Over time the device meas-

ures and reads out the amount of energy used. Water enters the property at 140 F and leaves at 120 F and the total flow rate through the meter for a month is 900,000 gallons. What would be the monthly energy bill if the charge for energy is 25 cents per million Btu?