How is an equity-method investment tested for impairment, and against what threshold?

When only part of an equity-method investment is sold, what cost basis is used for the gain, and what methods are prohibited?

How can another party's controlling interest affect whether a 30% holder has significant influence?

Under what circumstances might an investor holding less than 20% of voting shares still have significant influence?

What must be disclosed about investments in associates under IFRS 12?

Under the equity method, how does the investor record its share of the associate's income and dividends?

What voting-share range is used as a guideline for significant influence, and is it a strict rule?