Adobe Acrobat Pro DC--why 40% increase

adobe first year subscriptions (including acrobat) are offered at a discounted rate.  thereafter, the price rises and stabilizes (with some variation possible pending market forces).

if you're seeing something different, contact adobe support

Please check your Adobe account to find out what plan you have.

https://account.adobe.com/plans

FREE Acrobat Reader -- view, comment, print & sign PDF.
https://acrobat.adobe.com/us/en/acrobat/pdf-reader.html

Paid Acrobat Pro DC (USD $14.99/month)
https://acrobat.adobe.com/us/en/acrobat/acrobat-pro.html

I will GUESS that you purchased your subscription during a discount promotion

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