Vault upgrade...

I am current own a donated free vault ($20), which gives me 2 double chest.

Can I upgrade to 4 double chest from 2 double chest???

How much does it cost? 2000mtc or 4000mtc?

http://web.minetown.net/wiki/index.php?title=Automatic_Vaults

Thanks.

go to /warp vault and look at the prices for vault upgrades, then make a pe in your vault asking for it to be expanded, and tell them what you want to be put in your vault.