This year's Yushu Earthquake Relief Fundraising Party donated a total of 2.175 billion yuan, which was 661 million yuan more than the 2008 Wenchuan Earthquake Relief Party.
今年的玉树地震救灾募捐晚会共捐款21.75亿元，比2008年汶川地震救灾晚会多捐6.61亿元，算一算汶川地震救灾晚会捐款多少亿元．
<gadget id="calculator">21.7 - 6.61</gadget>
<output>15.09</output>

<result>15.09</result>