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# Video #10 - trigger a discount or fee with Fee & Discount Adjuster (formerly Custom Math) and conditional logic

  
# Trigger A Fee or Discount

* 1. Have the user select an option via simple buttons, radio buttons or checkboxes  
* 2. Create a Fee & Discount Adjuster element for each button (user selection)  
* 3. Add conditional logic on the Fee & Discount Adjuster (formerly Custom Math) element to trigger when the button gets selected  
  
Check out our [master guide for triggering a fee or discount](https://designful.freshdesk.com/en/support/solutions/articles/48001208121-master-guide-trigger-a-charge-fee-or-discount).