(I have two questions in 1 cause I only have 11 points)
(The homework is estimating with 2-digit divisors)

Marcy has 567 earmuffs in stock. If she can put 18 earmuffs on each shelf, about how many shelves does she need for all the earmuffs?

(question 2)
Howard pays $327 for one dozen collector's edition baseball cards. About how much does he pay for each baseball card?