Change:3 dozen oranges=36 oranges

The cost of a orange is:

90:4=22,5(cents)

The cost of 3 dozen oranges is:

 22,5 x 36=810(cents)

change 3 dozen = 36 oranges

the cost of an orange is:

90:4=22,5(cents)

the cost of 3dozen oranges is:

22,5*36=810(cents)

answer:810 cents

3 dozen oranges = 36 oranges

So the answer is: \(\dfrac{90}{4}\cdot36=810\) [cents]