Let's you perform calculations with b@se tags
[%calc [@grand_total@] - [@sub_total@] + 10 * 2 /%]
The calc tag lets you perform arithmetic on base tags and static integers for a variety of results.
You can perform calculations between static values, base tags, results from formatting with any of the operators below.
This can also be combined with the
set tag for more advanced calculations
||Brackets to specify the order of operations|