Hey @jcphoto,
Testing the code which @abwaita referenced within this reply on a default installation of WooCommerce it does indeed work correctly to dynamically update the product prices on a quantity change.
When testing the code snippet I used a the latest version of WordPress, WooCommerce and the free Storefront theme as the only enabled software.

Image Link: https://cloudup.com/cvz__klliN1
If the code is not working for you on your particular site for simple products the two possibilities for that are thee below.
- The code has been incorrectly added to the site.
- The WordPress theme your using is preventing the code from working.
With regards to variations, the price on those is displayed differently. This would then require a different approach to development.
It may be possible to have a developer write some custom code that could achieve this on variable products though. If you would like to investigate that possibility further, you could reach out to some of the official WooCommerce development partners via the link below.
https://woocommerce.com/customizations/