Consider a 2.3-kw hooded electric open burner in an area where the unit costs of electricity and natural gas are $0.10/kwh and $1.20/therm (1 therm = 105,500 kj), respectively. the efficiency of open burners can be taken to be 73 % for electric burners and 38 % for gas burners. determine the rate of energy consumption and the unit cost of utilized energy for both electric and gas burners. (round the final answers to three decimal places.)