2/10, net/29 means that the customer will get a 2% discount if the invoice is paid within 10 days. Then if they do not pay within those 10 days, the full balance would be due in 29 days.
So for this scenario the payment would be outside of the 10 day discount window so the full invoice balance of $460 is due.
Hopefully that helps! Feel free to shoot me a message if you have any other questions :)
Kyle