How much did a pint of milk cost in 1985?

As of today, a pint of milk averages around 30-50 pence, around 43-83 cents in US

Today, 43 cents would have been equal to $4.90 in 1920. So based off of today's exchange rates that would equal around £3.16.

Taking this all into consideration, a pint of milk in the 1920's would have equaled around .04 USD today, and .02p GBP.

This isn't totally accurate because the exchange rates were different 90 years ago, but this serves as a good estimation.