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() (Open Parenthesis and Close Parenthesis)
Specifies that the expressions within the open parenthesis and close parenthesis are evaluated first. All other expressions are evaluated using standard operator precedence.
Use
(expression1) expression2... and replace each expression with merge fields, expressions, or other numeric values.
(Unit_Value__c - Old_Value__c) / New_Value__c
calculates the difference between the old value and new value divided by the new value.
(DURATIONHOURS:SUM * RowCount) / 24 calculates the
duration of all event times the record count per 24 hours. This formula is a percent data type
that returns a positive or negative integer or decimal, representing what percent of a day is
spent on events.

