Suppose the demand curve is downward sloping, as shown in the following table. Calculate marginal revenue at each output level.

OUTPUT P AR MR MC AVC ATC 1 $140.00 2 130.00 3 120.00 4 110.00 S 100.00 90.00 7 80.00 70.00 60.00 50.00 $31.00 $31.00 $54.00 28.00 29.50 41.00 31.00 30.00 37.67 34.00 31.00 36.75 37.00 32.20 36.80 40.00 33.50 37.33 43.00 34.86 38.14 46.00 36.25 39.13 49.00 3767 40.22 52.00 39.10 41.40 10