A6-foot-long sub sandwich is cut into 8 equal pieces for a family to share. how long is each piece?
2 in.
6 in.
9 in.
12 in.

The answer is 9 inches.

There are 12 inches in every foot. 
6 ft x 12 inches/ft = 72 inches
72 inches / 8 people = 9 inches

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