=c. For each of the three products in turn, use the Solver Table

(available on the CD-ROM) to determine how the optimal solution for the model and the resulting total advertising cost would change if the required minimum increase in the sales of that product were to be systematically varied over a range of values (without changing the required minimum increases for the other two products). In each case, start the range of values at 0 percent and increase by 1 percent increments up to double the original minimum required increase.