收到某recuiter发来的一封email，中间有这么一段，"We are interested in hiring skilled computer professionals like you
who are looking for a change and want to keep most of the billing rate. We
can work with profit as low as 10% of the billing rate and can help with
H1B visa and green card sponsorship also."



请问，这个billing rate是什么？



谢谢。。。