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Formulas are used to specify calculations based on values in designated cells. Excel supports basic calculations as well as statistical, trigonometric and other specialized functions.
Formulas used in Excel must follow a certain syntax.
All formulas begin with an equals sign (=).
Some formulas use operands such as +,-, *,/ for addition, subtraction, multiplication or division. For example, the formula =A1+A2+A3 would add the contents of cells A1, A2 and A3.
Other formulas refer to different functions such as SUM, AVERAGE and others. For example, the formula =SUM(A1:A3) would add the contents for the range A1 through A3.
Formulas can be combined with operands. For example, the formula =10*SUM(A1:A3) would add the contents cells A1 through A3 and multiply them by 10.
Functions can be nested within each other. For example, the formula =SQRT(10*SUM(A1:A3)) would take the square root of ten times the sum of cells A1 through A3. When functions are nested, it is important that the number of left parentheses match the number of right parentheses.
I certainly can't take the time to explain v lookup to you in this forum, but I can direct you to several sites that you can familiarize yourself with it. It's going to take you time to to understand it.
You will never find a fully comprehensive list anywhere because there are literally hundreds in the basic Excel application and thousands that can be added in as you go via macros. More are being added every time a new version of Office comes out.
But, the easiest way however to get a basic list of functions if your not printing is to hit the function button and simply scroll down the list. The syntax (an example of the method by which you should be formatting the formula) and a definition will list in the bottom of the dialog as you select each function.
That said, you are better solving individual problems as you learn Excel then trying to memorize all the functions themselves. Many, such as mathematical operations are common sense anyway.
That depends on which version of Excel you are using. Excel 2003 supports up to 65,335 formulas Excel 2007 has no limit. you can communicate between the worksheets which are contained by one workbook (one excel-file). Communicating between files cannot be done with formula's.
Suppose the value for $ is stored in cell A3. Your formula would look like this: =(A3+A3*0.25)*1.5
The equals sign at the beginning of the formula is necessary. And if you want the result to be formatted as currency, you can do so by right-clicking the cell or column, format cell, number tab, choose currency.