Shown below are Book Worm Inc.s earnings per share for a hour year period, along with the per share market price of the companys stock at each year end. The earnings in 2021 were the highest in the companys history:
	2021	2020	2019	2018
Earnings per share	$9	$7	$6	$7
Percentage change	?	?	?
Year end stock price	$77	$140	$84	$70
Price-earnings ratio	?	?	?	?

a. Compute the percentage change in earnings per share in 2019, 2020 and 2021. b. Compute the price-earnings ratio of stock at the end of each of the four years. c. What does the price-earnings ratio at the end of 2021 indicate about investors expectations of earnings per share for the coming year? Explain your reasoning.