not answered 16.not answered 17.not answered 18.not answered 19.not answered 20.not answered 21.not answered 22.not answered 23.not answered 24.not answered 25.not answered 26.not answered 27.not answered 28.not answered 29.not answered 30.not answered 31.not answered 32.not answered 33.not answered 34.not answered 35.not answered 36.not answered 37.not answered 38.not answered 39.not answered 40.not answered 41.not answered 42.not answered 43.not answered 44.not answered 45.not answered 46.not answered 47.not answered 48.not answered 49.not answered 50.not answered question workspace the table given below shows the total revenue and total cost of producing a commodity. table 9.1 total output total revenue total cost 0 $0 $1,000 1 $1,700 $2,000 2 $3,300 $2,800 3 $4,800 $3,500 4 $6,200 $4,000 5 $7,500 $4,500 6 $8,700 $5,200 7 $9,800 $6,000 8 $10,800 $7,000 9 $11,700 $9,000 in table 9.1, the marginal revenue from the sixth unit of output is: