Unsure whether to c-bet?

[Pelion]

If Villain folds, Hero wins the dead money in the pot prior to the jam:
22bb + 9bb = 31bb

If Villain calls, Hero's EV is Hero's equity times the size of the pot:
51%*200bb = 102bb

Also note that the first of these is an EV calculation. The second is an equity calculation. The two are not the same and you can't draw a direct comparison between these numbers.

When villain calls, our EV is the difference between what we expect to end the hand with and our stack at the moment.

so EV if villain folds is +31bb.

EV if villain calls is 102 - 91 = +11b

You can also work this out as a 109bb (pot + villain stack) win 51% of the time, or a 91bb (our stack) loss 49% of the time. 0.51*109 - 0.49*91 = +11bb

31bb > 11bb so we want him to fold