In order to illustrate the proposed model, let us consider the following
values for the parameters: b = 0.25, h = 0.05, d = 1, A = $250/
per order, i = 0.35, c2 = $3/per unit/per unit time, c3 = $5/per unit,
c = $5/per unit. Besides, we take different values for parameters:
a, s and W in the following examples