The following formula is used to calculate the specific gravity of a material. Where SG = specific gravity, Ï = density of the material (kg/m3), ÏW = density of water ( kg/m3). The reference density of water at 4oC (39oF) is used as the reference as these are the conditions of maximum density.
Most business owners donât know how long they should hold on to old records. According to the IRS, hereâs how long you should keep those records: Permanently: 1  general ledgers and journals. 2  payroll records, including W-2s, 940s, 941s. 3  year-end financial statements.4  tax returns and supporting documents. 5  articles of incorporation, bylaws, meeting minutes, etc. 6  retirement plan records.ost business owners donât know how long they should hold on to old records. According to the IRS, hereâs how long you should keep those records: Permanently: 1  general ledgers and journals. 2  payroll records, including W-2s, 940s, 941s. 3  year-end financial statements. 4  tax returns and supporting documents.
A Decade of Records. How long you should keep your business records on file depends on the action, expense or event the document records, according to the Internal Revenue Service. Documents that pertain to transactions and payments should be kept for at least 10 years, according to Financial Web.his means you must have accounts payable records available so you may document gain or loss on a sale or disposal of an asset for the length of time in which the asset remains in service. Afterward, you must keep all records and receipts pertaining to the asset for an additional three years, according to QBalance.com.