Aunt Wang remitted 600 yuan from the post office to her son who was studying in a foreign university. According to regulations, the remittance fee was 0.9% of the remittance amount. How much is the remittance fee that Aunt Wang should pay?
王阿姨从邮局给在外地上大学的儿子汇款600元，按照规定，汇费是汇款数的0.9%．王阿姨应付汇费多少元．
<gadget id="calculator">0.9 / 100</gadget>
<output>0.009</output>

<gadget id="calculator">600 * 0.009</gadget>
<output>5.4</output>

<result>5.4</result>