(b) Another machine is available for sale, with the following output function: Machine 3 Number , of Revenue Marginal workers revenue 0 $0 1 $1,500 $1,500 2 52.900 51,400 3 $4,200 $1,300 4 $5,400 $1,200 5 $6,500 $1,100 6 $7,500 $1,000 7 $8,400 $900 8 $9,200 $800 9 59.900 5700 10 $10,500 $600 11 51 1,000 5500 12 51 1,400 5400 13 $1 1,700 5300