Mass Action Round Prices

-- url of the page with the problem -- : aquacorals.com
-- HikaShop version -- : 4.0.1
-- Joomla version -- : 3.9.1
-- PHP version -- : 7.2
-- Browser(s) name and version -- : Firefox 63.0.3

What would be the correct equation to round all prices to the nearest even dollar amount?

in Mass Actions I've got price_value=operation=round(price.price_value*1,2) to change a price like 57.33 to 57.00 or a price like 45.67 to 46.00
Is that correct?

Perfect. Thanks!