A bookstore purchases $$20$$ story books for ＄$$820$$. If the bookstore wants to earn ＄$$12$$ for each book, what is the selling price of each book? 
选项为:A:＄$$50$$  B:＄$$51$$  C:＄$$52$$  D:＄$$53$$  请回答其中一个选项.