Northwest manufactures smart televisions, Information concerning costs and number of smart televisions manufactured for three months during 2020 appear below. Month Activity Cost April 18,000 smart televisions $84,000 May 21,000 smart televisions 94,500 June 20,400 smart televisions 94,800 Using the high-low method, what is the amount of total fixed costs? Select one: 0 $3,000 0 $21,000 $10,500 $78,857