At the Hill Valley Aquarium, visitors can upgrade their ticket to include a live dolphin show or a movie about whales. Last month, the aquarium's manager recorded the number of visitors
who attended the events each day. Witch event had a higher number median number of visters

I'm not sure exactly but my best guess would be 1/4

Im pretty sure it’s the first one

So don't take my word i'm not exactly a mathematical person but i would assume a. because while selling the soap every month you increase in sells so you would by 11 percent. the you would get the factor 0.89 which if i had to guess would be the monthly profit over 11 probably wrong tho