我可以计算出SQL Server中两个日期之间的周末天数吗？

I'm calculating income of hiring equipments for a report. In that, hiring cost in weekend days will be plus 10% more if compare with normal days. So how can I calculate there's how many weekend days between two dates. And in report query, I can't use DECLARE also. Can someone help me to do this. Thank you so muchI'm calculating income of hiring equipments for