By default WooCommerce displays regular price (Provided there is no sale price available) or Sale Price with striked regular price on Shop and Single Product pages.
But if you would like to change format or show Sale Price and Regular Price in different format here is a simple method to achieve this.
It requires changes in WooCommerce “price.php” template for both Single Product and Shop (Loop Pages).
How to change price display on Single Product page.
Template file Path: [Your Child Theme Folder]/woocommerce/single-product/price.php
How to change price display on Shop or Catalog pages.
Template file Path: [Your Child Theme Folder]/woocommerce/loop/price.php