The faces of this triangular pyramid are equilateral triangles. Draw a net of the pyramid
and use it to find the surface area.
10.4 ft
12 ft
12 ft

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