Brightness Group

Woocommerce product backend page add markup(%) field in which add percentage which you want to increase price of product using plugin. if you want to decrease by some percentage add markup(%) field value as nagative.
eg. 
1) Product price $150 and if increase value by 20% in backend add 20 and its display price in frontend $180. 
2) Product price $150 and if decrease value by 20% in backend add -20 and its display price in frontend $120.
<h4>Required Plugin</h4>
Woocommerce

Product Price Markup for Woocommece

Price increase by percentage for WooCommerce Shop product.

Sami Ahmed Siddiqui

Search engines such as Google are using structured data markup in many ways—for example, to create rich snippets in search results. Search results with rich snippets will improve your click through rates and increase the number of visitors on your website.
This plugin helps:
<ul>
<li>Helps your site to earn rich snippets in Google’s SERP.</li>
<li>Does not depend on other plugins or external code.</li>
<li>You can configure the plugin from the settings page.</li>
<li>You can activate schema’s according to your requirement. Multiple schema types are available.</li>
</ul>

JSON Structuring Markup

JSON Structuring markup is simply the easiest solution to add valid schema.org as a JSON script in the head of posts and pages.

Product Price Markup for Woocommece vs JSON Structuring Markup