Please answer the following question quickly, showing all work accordingly on all sections. Thank you.

The S\&P 500 index delivered a return of 10%,15%,15%, and 20% over four successive years. What is the arithmetic average annual return per year? A. 5% B. 6% C. 4.5% D. 7% Amazon.com stock prices gave a realized return of 5%,5%,10%, and 10% over four successive quarters. What is the annual realized return for Amazon.com for the year? A. 2.5% B. 1.25% C. 1.25% D. 0.00% A. 9.2% B. 16.8% C. 18.4% D. 8.3%