To calculate the total cost, let's break down the purchases and apply the discount:
Price per pack of socks: $17.99
Buy one pack, get the second one at 1/2 off:
- 1st pack: $17.99
- 2nd pack (1/2 off): $17.99 / 2 = $8.99
Total cost for 2 packs of socks: $17.99 + $8.99 = $26.98
Since you want to buy 3 packs of socks, we'll calculate the total cost:
Total cost for 3 packs of socks: $26.98 x 3 = $80.94
However, none of the provided options match this total. The correct answer is: None of the above.