An assignment problem that has an objective of maximizing profit is solved as a minimization problem after converting all cost values into what values ?

To solve an assignment problem with the objective of maximizing profit, the cost values need to be converted into profit values. This can be done by subtracting each cost value from a constant value, such as the maximum cost value in the problem. By doing this, the problem can be transformed into a minimization problem, where the objective is to minimize the total cost.