i have a price(currency data type) and currency(pick list data type i.e(INR,USD,GBP)) custom fields in account object.when ever i enter a value in price(INR 70) field it should display the corresponding value as INR 70(USD 1) in price field in visualforce page. Any help on this issue is highly appreciated

i have a price(currency data type) and currency(pick list data type i.e(INR,USD,GBP)) custom fields in account object.when ever i enter a value in price(INR 70) field it should display the corresponding value as INR 70(USD 1) in price field in visualforce page.how to write controller for my requirement Any help on this issue is highly appreciated

Apex page :

<apex:page standardController="account" extensions="convert" > <apex:form > <apex:pageBlock > <apex:pageBlockSection > <apex:inputField value="{!account.name}"/> <apex:inputField value="{!account.price__c}"/> <apex:inputField value="{!account.currency__c}"/>

      </apex:pageBlockSection>
          <apex:pageBlockButtons >
              <apex:commandButton action="{!save}" value="Save"/>
          </apex:pageBlockButtons>
  </apex:pageBlock>

</apex:form> </apex:page>