English to Polish Bus/Financial Finance (general) profit and loss account

"There are no material differences between the profit on ordinary activities before taxation and the retained profit for the year stated above and their historical cost equivalents."
Nie wiem, o jakie ekwiwalenty tu chodzi, a ponadto chciałabym się upewnić, czy różnice są między "profit on ordinary..." a "the retained profit..." i "the historical cost...", czy też między tymi zyskami a "the historical cost...".