Silky wants to induce the retailer to order as many shirts as the integrated company would order in Part b (1260 units). One strategy that Silky is considering is to offer a "buy-back" contract to the retailer, in which case Silky will purchase back any unsold shirts by the end of the season (the retailer no longer sells the remaining shirts by itself). At what price would Silky have to buy back the unsold shirts to induce the retailer to order as many shirts as the integrated company would order in Part b)?