Suppose you invest $850 in an account paying 7% interest per year. a. What is the balance in the account after 3 years? How much of this balance corresponds to "interest on interest"? b. What is the balance in the account after 34 years? How much of this balance corresponds to "interest on interest"?

Please show the work and how it will be placed in excel. This is also a 2 part question. The second part appears after the first part is answered. Thank you.