A typical car driven 12,000 miles a year emits to the atmosphere about 11 kg per year of NO x (nitrogen oxides), which cause smog in major population areas. Natural gas burned in the furnace emits about 4.3 g of NO x per therm, and the electric power plants emit about 7.1 g of NO x per kWh of electricity produced. Consider a household that has two cars and consumes 9000 kWh of electricity and 1200 therms of natural gas. Determine the amount of NO x emission to the atmosphere per year for which this household is responsible.

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11 kg NO, per year