Sumbody help please . no links or files

Do you need with the x value for the minimum? its always between the two intercepts for a parabola

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