Nokia 6590i - Manual (Page 149)

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4 Press Options. The following list of options appear in the screen.
Use the scroll key to highlight an option. Press Select to confirm.
5 Press Select to complete the calculation as selected in the calculator
options. The sum of your calculation appears in the screen.
Note: The calculator has limited accuracy and rounding errors my
occur, especially in long division.
Use currency conversion
EDIT THE EXCHANGE RATE
1 At the Start screen, press Menu 7-1 (Calculator). After a brief pause,
the calculator screen appears.
2 Press Options.
Exchange rate appears.
3 Press Select and scroll to one of the following options.
Calculator options
Equals Displays the sum of your calculation
Add Adds numbers in the calculation
Subtract Subtracts numbers in the calculation
Multiply Multiplies numbers in the calculation
Divide Divides numbers in the calculation
Square Squares numbers in the calculation
Square root Square root of the numbers in the calculation
Change sign Return to the previous screen to select another sign for
the calculation (plus sign, minus sign, etc.)