问题关于数字的问题

TTSONIC

[SWOOSH]
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2003-04-17
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Received $690 - This amount included a 10% discount
Received $680 - This amount was less a 10% discount

晕死了,到底什么意思啊:wall:
 
第一个原价$759? 690+(690X10%)

第二个原价$748? 680+(680X10%)

不确定 猜的
 
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