Given an increase in the market demand for its product, a firm decides to hire an additional worker. the amount of output produced by 25 workers is 80 units. the marginal product of the 26th worker is 15 units. after the 26th worker is hired, the total output would increase to

A marginal output or physical output is the change of the number of output which is a direct factor of the production that is given by an additional employment of by additional number or unit of workers. In this case, it is given that the marginal output of the 26th worker is 15 units. 

To determine the total number of outputs that the employees will have when the 26th member is hired is equal to the sum of the initial amount and the marginal product. That would be equal to 80 plus 15 which is equal to 95. 

The total output increase would be equal to 15.