The administrator or the board of administration, or other form of administration specified in the bylaws, shall keep a book with a detailed account, in chronological order, of the receipts and expenditures affecting the property and its administration, and specifying the maintenance and repair expenses of the common elements and any other expenses incurred. Both the book and the vouchers accrediting the entries made thereupon shall be available for examination by all the co-owners at convenient hours on working days that shall be set and announced for general knowledge.