Loaded Commerce Community

Hi!

Recently our taxes raised from 16% to 18%.
All the prices in our store were, with TAX included, ending in .95 (you know, that old marketing price scheme of 11.95, 199.95, 499.95, etc)

How can I modify EVERY PRICE in the database and deduct a 2% on it?

I'm assuming taxes are calculated on realtime based on the tax free price on the products table, right?
so for every product, i need to update its tax free price to get a 2% deduction, so I eat the TAX increase instead of my customers... and our prices will be back to .95

How?

Thanks!!!