Write the unit rates for both problems.
1. Eric bought 4 pounds of pistachios for 12$
2. Bettina spent $10.50 on 4 books.
+36916 dollars per pound would be $ 12/4lb = 3 dollars per pound
pound per dollar would be 4 lb/ $12 = 1/3 lb per dollar
$ per book would be $10.50 / 4 bks = 2.625 dollar per book
book per dollar would be 4 bks / $10.5 = .381 book per dollar
