Find three numbers whose product is -64. You may use
integers from -10 to 10. You may not use the same absolute value twice.
Find all possible combinations.

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