Dave borrowed $7200 from his uncle with simple interest of 9% and eventually repaid $9792 (principal and interest). What was the time period of the loan?

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