This one is called WooCommerce Bulk Percentage Pricing. And quite simply it does just one thing: it allows you to completely update all of your store pricing for all of your products all at the same time by a percentage. So if you want to raise your prices by 10% on everything across the board or 5% off sale on everything across the board or something like that, this one plugin allows you to do that with just a few clicks. So you can adjust all of the store pricing within just a minute or so. Very handy plugin and I gave it a 8 out of 10.