Less-than-Perfect Competition TR - TC = Number of Total Marginal Marginal Profit Units Sold Revenue Revenue Cost Total Cost $0.00 $0.00 $0.00 $0.00 $20.00 $17.50 $6.50 $6.50 $13.50 $40.00 $12.50 $7.00 $13.50 $26.50 $60.00 $7.50 $7.50 $21.00 $39.00 $80.00 $2.50 $8.00 $29.00 $51.00 $100.00 ($2.50) $8.50 $37.50 $62.50 $120.00 ($7.50) $9.00 $46.50 $73.50