Chris and Debbie want to buy the same book, but they do not take enough money. Chris needs $$2$$ dollars and $$30$$ cents more to buy that book. Debbie needs $$3$$ dollars and $$80$$ cents more to buy that book. The sum of their own money is equal to the price of the book. How much is the book? 
选项为:A:$$2$$ dollars and $$30$$ cents  B:$$4$$ dollars and $$60$$ cents  C:$$7$$ dollars and $$60$$ cents  D:$$3$$ dollars and $$80$$ cents  E:$$6$$ dollars and $$10$$ cents  请回答其中一个选项.