After a discount of $$30\textbackslash\%$$, the price of a bed is＄$$210$$. Besides, senior citizens are given a further discount of＄$$15$$. What is the percentage discount given to senior citizens for the bed? 
选项为:A:$$30\textbackslash\%$$  B:$$32\textbackslash\%$$  C:$$35\textbackslash\%$$  D:$$36\textbackslash\%$$  请回答其中一个选项.