even as a programmer I find the rates hard to understand I would expect or like to see something easy like
[costs_table prop="cost" table="0-29.99=7.99|30.00-49.99=|9.00|50.00-74.99=13.99|75.00-99.99=17.00|100.00-149.99=21.00"]
if you cant use the = since its a operator use- but pipe on each rate.
Rick