AA 27 请问最后一句话是什么意思

The following appeared in a memorandum from a member of a financial management and consulting firm:
“We have learned from an employee of Windfall, Ltd., that its accounting department, by checking about 10 percent of the last month’s purchasing invoices for errors and inconsistencies, saved the company some $10,000 in overpayments. In order to help our clients increase their net gains, we should advise each of them to institute a policy of checking all purchasing invoices for errors. Such a recommendation could also help us get the Windfall account by demonstrating to Windfall the rigorousness of our methods.”
Discuss how well reasoned . . . etc.

一直读不懂这句话，请问谁能帮我解释一下：Such a recommendation could also help us get the Windfall account by demonstrating to Windfall the rigorousness of our methods.

谢谢！

如下出现在一个金融管理和咨询公司员工的备忘录中：

我们从Windfall公司的一个员工处得知，Windfall公司财务部，通过检查大约10％的上月购买发票的错误和不一致，节约了10,000D本来要多付的钱。为了帮助我们的客户增加净收益，我们应该建议我们每个客户建立一个政策去检查所有的发票的错误。如此一个建议有助于我们获得Windfall这个客人，通过向Windfall展示我们的严格方法。

待讨论，谢谢。