The following formula is used to calculate the specific gravity of a material. SG = Ï / ÏW. 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.
Donât throw bank statements away after six years. August 12, 2013 85237 ViewsFacebook: 808Twitter: 41. The conventional wisdom is you only need to keep bank, credit card and other personal finance documents for six years. This is because HMRC (the taxman) can only ask you to go back that far if youâre being investigated for tax purposes.
Length of time to keep, and why: From one year to permanently. Keep the quarterly statements from your 401(k) or other plans until you receive the annual summary; if everything matches up, then shred the quarterlies. Keep the annual summaries until you retire or close the account. Bank records: Length of time to keep, and why: From one year to permanently