【正确答案】 March 12
Dear Mr. Leo,
This is Li Ming, Sales Manager from Ruijia Trade Company. I'm writing to you to ask about the issue of payment.
We believe you received our first group of 50 No. T42 computers one week ago, but we don't receive the payment till now. We hope that your company can comply with the contract to pay.
The deadline is the last day of this month. We will resort to the law for help if we can not receive the due money at that moment.
Sincerely yours,
Li Ming