Which of the following was not something colonial children had to do? Never eat in the presence of adults.
Bow when they approached their parents.
Have their parents permission whenever they went outside.
Never argue with their siblings.

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