i live in singapore, what type of currency yahoo charge me when i make oversea call

i live in singapore, what type of currency yahoo charge me when i make oversea call?
1. i already purchased, what type of currency when i make purchase for the call?
Yahoo! Messenger - 2 Answers
Random Answers, Critics, Comments, Opinions :
1 :
All charges are in USD
2 :
They're Singapore dollars. The rates are listed below: http://sg.voice.yahoo.com/phone_calls.php

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