1. (2021八下·哈尔滨开学考) Frank,a Grade 8 student, plans to go mountain climbing with his parents and his66-year-old grandparent. According to the price list, they need to pay _____  yuan for the tickets.

The Price of the Tickets
Adult (aged 65 and above)	Adult (aged under 65)	Child (aged 6-17)	Child (aged under 6)
￥ 30	￥40	￥ 20	Free