How would i estimate to find how many students are in fourth grade?

Since 26% is very close to 25% you could say it's about 1/4 of 200 that's about 50 students in 5th grade

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