Answer:
The rise in the price per head = 20
Explanation:
Data provided in the question:
Demand: QD = 1000 - 5P
Number of head of beefs produced in the short run = 500
Now,
At Q = 500
500 = 1000 -5P
or
5P = 500
or
P = 100
At Q = 400
400 = 1000 - 5P
or
5P = 600
or
P = 120
Hence,
The rise in the price per head = 120 - 100
= 20