Which of the sets shown includes the elements of Set Z that are both odd numbers and multiples of 5? Z=\ -15,-12,-10,2,7,10,20\

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