Help with business pls

Rose bought a mattress for her guest bedroom for $100, on sale. the mattress is nonreturnable. although everyone who has slept on the mattress said it was very uncomfortable, rose will not get rid of it because she spent $100 on it. what psychological factor associated with behavioral economics explains rose's behavior?

Someone me with this i have no idea what i'm doing. : )

Patricia works in a coffee shop and manages the inventory of items. for each item, she needs to record the quantity in stock and the quantity sold. how should she maintain the data?