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@diya I do memorise the stuff in this topic however sometimes you might forget in the exam so following is the method i used to memorise the appreciation/depreciation of the foreign currency (of your subsidiary)
GBPUSD 1.5 (1gbp = 1.5usd)
A subsidiary in US owned by a UK company, has an asset of $150k (which means £100k)
Now, depreciating your foreign currency GBPUSD 2.0 (1gbp = 2usd)
your existing asset in the US subsidiary $150k is now only £75k.
Hence, depreciation FOREIGN currency = LOSS in ASSET
the opposite of that is GAIN in LIABILITY (theory behind it? since depreciated foreign currency resulting in a loss in the subsidiary’s asset value, likewise the liability will be smaller too. Remember liability is negative hence smaller negative = gain!)
And obviously the opposite of depreciation (appreciation):
GAIN in Asset
LOSS in Liability
hope that helps.