Commas with "ranged from a low of X .... to a high of X ... "

Does there need to be commas after “day” in both instances? Would this be considered a contract situation for which I would need commas to separate, or is it a string of prepositional phrases that do not require commas?

… the period under review ranged from a low of $10 per day, to a high of $20 per day, with an average of $15 per day.