There is no way to calculate the value of 'f', since it is not part of an equation.
1, 2, 3, 4, 6, 12, F
Most keyboards have 12 function keys. F1-F12 (all the keys with the letter 'F' and then a number).
$3.00
Retail list is $5.00 in F-12
1,750$
The abbreviations G-4, F-12 & EF-40 are numismatic grades and can be used on any coin.
Assuming you mean Indian Head cent 1887 retail value is $6.00
12
Your gun was made in?æ1924. The F stands for field grade, and the 12 for 12 gauge. They value around $300.
Ctrl - SAlt - F - SF12 (Save As)Shift - F12 (Save)
If you have this coin, count your blessings! In a mint state of fine (F12), its value is worth: $120,000!
Coin grades consist of broad categories designated by letters, and within each of those there are finer subcategories indicated by numbers. "F" stands for "Fine", a grade meaning moderate wear. Within the F grade there are 8 numeric levels ranging from 12 to 19. Thus an F12 is the lowest grade a coin can have within the Fine category and an F19 is the highest. A coin that's more worn than F12 falls into the VG (Very Good) or lower category, and a coin that's better than F19 becomes VF (Very Fine) or higher.