A particle moves on the hyperbola xy = 18 for time t >=0 seconds. At a certain instant, y = 6 and dy/dt = 8. Which of the following is true about « at this instant?

I'm sure the answer is a

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