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.

mborgelt

51Blocks JSON Schema Creator allows business owners to add schema markup to a single page or entire site without outputting the markup on the actual site. This tool also makes it very easy to validate your markup against Google Structure data testing tool
Schema is the result of collaboration between Google, Bing, Yandex, and Yahoo! to help you provide the information their search engines need to understand your content and provide the best search results possible at this time.

51Blocks JSON Schema Generator

51Blocks JSON Schema Creator allows business owners to add schema markup to a single page or entire site.

Product Price Markup for Woocommece vs 51Blocks JSON Schema Generator