The Total Physical Output of a Number of Machines or Workers

Multiple Choice

The total physical output of a number of machines or workers is called physical productivity and is a function of the number of machines or workers. If is the productivity, is the marginal physical productivity. If the marginal physical productivity for bricklayers is , where P is the number of bricks laid per day and x is the number of bricklayers, find the physical productivity of 5 bricklayers. (Note: when .) ​

A) 88,330 bricks laid per day
B) 719,114 bricks laid per day
C) 715,550 bricks laid per day
D) 68,255 bricks laid per day
E) 552,925 bricks laid per day