What was the arithmetic average return for a stock that had the following annuat returns over the past 4 years: 15,00% (4 years ago), 11,00W(3 years ago). 16,00% (2 years ago), and -36.00w (last year?) (Round the value to 100th decimal and Please enter the value only without converting it to a decimal format. If the answer is 8.55 . enter 8.551