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This thread is resolved. Here is a description of the problem and solution.
Problem: The function to get the exchange rate of a currency
Solution: WPML/WooCommerce Multilingual don't have a API/hook function for this purpose. But we can use following code for this purpose.
global $woocommerce_wpml; echo $woocommerce_wpml->multi_currency->exchange_rate_services->get_currency_rate('KRW');