***I Understand how to get this answer. But I do not know how to do this in excel*** You annually invest $ 1,500 in an individual retirement account (IRA) starting at th eage of 20 and make the contributions for 10 years. Your twin sister does the same starting at age 30 and makes the contributiions for 30 years. Both of you earn 7% annually on your investment. Who has the larger amount at age 60? Show all computations and solve for the exact amount of the difference .