Answer:
1. Will Crump apply the new method retrospectively or apply the new method prospectively?
Retrospectively:
Crump will first need to adjust its current balance to reflect the change to equity method. Since the company holds different stocks, we must use the general investment in securities account for $48 million - $31 million = $17 million.
Dr Investment in securities 17,000,000
Cr Retained earnings 17,000,000
Then the previous balances must be adjusted but just for comparative purposes and disclose the reasons why the change took place in the footnotes.
2. Suppose Crump is changing from the equity method rather than to the equity method.
Prospectively:
It doesn't need to adjust anything (the carrying value remains the same), just disclose the change in the footnotes. The company just switches to the accounting method.