句子文法確認

Concerning the warehouse fee of Invoice No. 123(HK$500), Mr. Chan has agreed to reduce our invoice by 50% discount.
We should be grateful to receive your payment at your early convenience.(意思是:關於發票號123(總金額港幣500元)的倉儲費... 陳先生已同意給予貴司發票總金額50%折扣優惠.煩請貴司盡快支付折扣後的餘款)
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