If i put $300 in an account that earns 5.5% compounded yearly, how much will there be in the account at the end of 21 years

Draw a tape diagram to represent each situation.for some of the situations,you need to decide what to represent with a variable andre bakes 9 pans of brownies.he donates 7 pans to the school bake sale and keeps the rest to divide equally among his class of 30 students