Magento - multiple base currencies

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
Multiple base currencies.
We need to specify different base currency per product. That currency should be displayed at frontend.
Eg. some supplier charges dollars another one euros. The main idea is to have select box in price tab administration with other currencies than basic and a text field for amount. If these are filled, then the main basic price in initial currency should be calculated based on exchange rate once a week (cron job). The alternative (new) base currency should be shown next to main (global) currency and in a product view a note should tel smth. like "this is main price and a CZK price is calculated with actual exchange rate". Every other calculations (chart, invoice, sums) should be done with main base currency. Setting foreign currency as a base (based on price calculation with current exchange rate) should preserve vendor from exchange rate changes fluctuation.

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