comparing temporal/all-current methods for interest coverage ratio

If the local curreny is appreciating, which method will get a higher interest coverage ratio? Is Interest in I/S statement converted with the average rate? Why can’t I find it in Schweser notes?

all other expenses are converted at average rate. (except COGS and Depreciation, which have different rules). COGS, Depreciation -> Historic (Temporal), Average (Current Rate).