The table assumed that there is one fixed factor.

Units of Labor	Total Product	Average Product	Marginal Product
1	20	20	20
2	50	25	30
3	90	30	40
4	120	30	30
5	140	28	20
6	150	25	10
7	150	21.3	0
8	140	17.3	-0

Use a bracket to identify what is being asked in the following.

1. Determine the first stage of production.

2. Determine at what point AP and MP intersect.

3. Determine the second stage of production.

4. Determine the third stage of production.