How would you write 4 cubed?
12
4^2
4^3

Your answer would be 4^3 ,, the 3 means cubed and the 2 means squared

The answer to your question is 1/9

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