The $$cost $$of $$the $$operation $$and $$a $$statement $$of $$the $$difference $$in $$the $$methods $$of $$evaluating $$the $$safes $$for $$the $$three $$cases$,$whether $$there $$were $$goods $$in $$operation $$at $$the $$beginning $$of $$the $$period $$or $$if $$they $$were $$not $$able $$to $$be $$placed $$in $$detail$.$