Display the default discounted price and percentage on Woocommerce products

// For product variations
add_filter( 'woocommerce_available_variation', 'custom_variation_price_saving_percentage', 10, 3 );
function custom_variation_price_saving_percentage( $data, $product, $variation ) {
    $active_price  = $data['display_price'];
    $regular_price = $data['display_regular_price'];

    if( $active_price !== $regular_price ) {
        $saving_percentage = round( 100 - ( $active_price / $regular_price * 100 ), 1 ) . '%';
        $data['price_html'] .= sprintf( __('<p class="saved-sale">Save: %s</p>', 'woocommerce' ), $saving_percentage );
    }
    return $data;
}

// For simple products
add_filter( 'woocommerce_get_price_html', 'change_displayed_sale_price_html', 10, 2 );
function change_displayed_sale_price_html( $price, $product ) {
     // Only on sale products on frontend and excluding min/max price on variable products
    if( $product->is_on_sale() && ! is_admin() && $product->is_type('simple') ){
         // Get product prices
         $regular_price = (float) $product->get_regular_price(); // Regular price
         $sale_price = (float) $product->get_price(); // Active price (the "Sale price" when on-sale)

         // "Saving Percentage" calculation and formatting
         $precision = 1; // Max number of decimals
         $saving_percentage = round( 100 - ( $sale_price / $regular_price * 100 ), $precision ) . '%';

         // Append to the formated html price
         $price .= sprintf( __('<p class="saved-sale">Save: %s</p>', 'woocommerce' ), $saving_percentage );
    }
    return $price;
}