Prices question

[Eugene Morozov]

Hello,
I'm new to ledger. I've compiled and installed Ledger 3.0 from git
repo (version Ledger master-0-g769b4ba).

I've created the following data file to test ledger:
; -*- ledger -*-

N $
N RUR

2009/02/22 * sample
  Assets:Cash                     500 RUR
  Equity:Opening Balances

2009/02/22 * another sample
  Assets:Bank:Debit card          $50
  Equity:Opening Balances

2009/02/22 * transfer
  Assets:Cash                     $10
  Assets:Bank:Debit card

Also, I've created the test prices db:
N $
N RUR

P 2009/02/22 04:47:01 $ 36 RUR


But when I use command ledger --price-db .prices.db -V bal I get the
following output:
                 $50
             500 RUR  Assets
                 $40    Bank:Debit card
                 $10
             500 RUR    Cash
                $-50
            -500 RUR  Equity:Opening Balances

What command should I use to get output in a single currency?

Also, different banks use different currency exchange rates. What if I
make more than one transaction involving two currencies on the same
day in different banks with different exchange rates?

Eugene