Is this correct?

|-4+5i| √-4²+5²
√-16+25
√-9
=3

Jehhnd. rhehbf ehnd new e hw ended nehru shh snow rheh 6 cents!

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