Financial Appraisal - Discounting

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Suppose we were given a discounted cost of $50,000, which has been generated using a discount factor of 3.5% and a time-horizon of 45 years.

Is it possible to obtain what the non-discounted cost is today?

For clarity, this is not as part of a test. Instead, it is an intellectual curiosity, where I simplified the figures taken from Page 4, Paragraph 4 of this paper:

https://www.england.nhs.uk/wp-content/uploads/2018/07/patent-foramen-ovale-closure-evaluation-report.pdf

My own intuition would be that the sign of the exponent is flipped, would this be correct?

Feedback from the mathematicians would be appreciated,

Best,

Andrew