Jack runs a small bagel shop and is considering replacing his four employees with automated machines that allow customers to buy their bagels without any human interaction. Of the following, the most difficult task Jack faces in computing the NPV of this change is estimation of the ______

A. total change in sales that will result from the change.
B. cost of purchasing the new equipment.
C. reduction in wages he will have from the decrease in work force.
D. reduction in taxes he will get from the increase in depreciation.
E. cost of installing the new equipment.

Correct Answer: A