A store charges the same amount for each pair of socks. A customer can buy 3 pairs of socks for $7.80. Henry bought 4 pairs of socks when they were each on sale for 10% off. He also bought a pair of shoelaces. Henry spent a total of $11.58. How much was the pair of shoelaces?

$1.13
$2.22
$2.34
$2.60