How to Easily set a Percentage Selling Rate to an Item's Valuation Rate

Because it would be easier than calculating and setting the selling price manually.

Is there a way to automatically generate selling prices after setting a percentage over the current Valuation Rate?

Example, a manufactured product that is valued 60€ and we want to sell for over 30% the price should be 78€ automatically.

Anyone found a workflow or script to do this?