If i was born in 2002 how old will i be in 2130

To find that, we have to find the difference of 2130 and 2002, which is
2130-2002=128. We use subtraction due to that we start in 2002 but end in 2130, and therefore find the difference

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