Janet's Bouquets stocks fresh$-$cut flower bouquets on a weekly basis that sell for $$60$ each and have a purchase cost of $$30$ per dozen. Unsold week$-$old bouquets are reduced in price to $$20$ each and are always completely sold without affecting the current week's demand for fresh$-$cut bouquets. Janet, the owner of the flower shop, estimates weekly demand characteristics for fresh$-$cut bouquets as follows: