Estimate the unit rate of 12 pairs of socks sell for $5.79

Estimate

ok, so that would be the cost per unit

that is cost divided by the socks

one way is we could say 12 socks is close to 10 socks so
5.79/10=0.579 so about $0.58 per sock

or, we could  round 5.79 ro 5.8

then
5.8/12=2.9/6=1.45/3≈0.39

so about 40 cents per sock