$$\frac{820}{20}+12=41+12=53$$. 
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? 
Options:
  - ＄$$50$$ 
  - ＄$$51$$ 
  - ＄$$52$$ 
  - ＄$$53$$ 