I know that if you want to express "X-tenth(s)", you can use 成. For example:
However, these only express the figure at one decimal point. If you want to express any figure at two or more decimal points, can you still use 成? For example:
黄金周五成北京市民选择的是4至6天的行程。 # one-decimal point (0.5)
黄金周五十五成北京市民选择的是4至6天的行程。 # two-decimal points (0.55)
Or if you can't, how can you express the figure usually?