Format Report to Calculate column?

i have a problem but not experience with reports… i need add to ticket print a calculate tip but without afect any more of ticket (just in print) to expose tip in 10% value, 20% value, 30% value (like hotters up to 100% value)… i want to ticket result like this…

this for thicket but only on preview calculate for client selection tip.

tanks for help

[=F({TICKET TOTAL}*1.3)] would give a total with add 30%… Highly need to come back with conf of the syntax of formula as am on mobile at the minute.

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