Update all prices using mass action

-- HikaShop version -- : hikashop Business 3.0.1
-- Joomla version -- : Joomla! 3.6.0 Stable
-- PHP version -- : 5.4.45-0+deb7u2
-- Browser(s) name and version -- : Safari 10.1

Hi team!

I would like to update 5% in all prices from my products, using mass action.

How i have to do?

Regards,

Leo