句子的 he , 他,指的都是同一个人.
But as he was a miserly person he thought he would find out what he would have to pay this doctor.
句子是说（意译）
因为他小气,他认为他应该先问清楚究竟要付这位医生多少钱.
希望帮到了你,满意敬请采纳,谢谢.