The amount of warpage in a type of wafer used in the manufacture of integrated circuits is exponentially distributed with a mean of 1 mm. A random sample of 400 wafers is drawn. What is the probability that the sample mean exceeds 1.05 mm

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