how to add percentage markup filter in trello

[John Hicks]

id like to add a filter on my card that adds up the sum total with a 40% markup

[Ryan]

Hi John,

It is possible to set up this with a Butler rule whereby you can use a trigger of a custom field being set to make a calculation and set another custom field to the result. Here is some information about this: https://help.trello.com/article/1161-custom-field-arithmetic. Alternatively, you could take a look at the Smart Fields Power-up which is offered by a third-party and allows you to make calculations within the fields.

Thanks!

Ryan