Nokia 3230 - Manual (Page 159)

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The conversion order changes if you write a value in the second Amount field. The
result is shown in the first Amount field.
Setting a base currency and exchange rates
Before you can carry out currency conversions, you need to choose a base
currency (usually your domestic currency) and add exchange rates.
The rate of the base currency is always 1. The base currency determines the
conversion rates of the other currencies.
1. Select Currency as the measurement parameter type and select
Options → Currency rates . A list of currencies opens and you can see the
current base currency at the top.
2. To change the base currency, scroll to the currency (usually your domestic
currency), and select Options → Set as base curr. .
3. Add exchange rates, scroll to the currency, and enter a new rate, that is, how
many units of the currency equal one unit of the base currency you have
selected.
4. After you have inserted all the required exchange rates, you can make currency
conversions. See “Converting units” on page 158.