Answer:
Casey paid 2.25 in the required currency for each pair of socks.
Explanation:
Casey spent a total of $81.60 on both 12 pairs of socks and 3 pairs of shoes.
A pair of shoe = 18.20, then;
3 pairs of shoe = 3 x 18.20
= 54.60
The amount spent on socks = total amount - amount spent on shoes
= 81.60 - 54.60
= 27.00
So that,
The price of each pair of socks =

=

= 2.25
Casey paid 2.25 in the required currency for each pair of socks.