It's too late for this, the math part of my brain is already asleep, but I feel the impulse to do this anyway.
Assumption: 8027% is not a random number meaning "a lot".
So, no number lower than 100 yields an integer when multiplied by 81.27*, and that means that the number of previous sales must be a multiple of 100, which is, uh, well, 0.01 probable, but okay. Therefore, sales must be a multiple of 8127. What am I doing wrong.
* A 8027% increase means (x + 80.27x), which is (81.27x).
In context, 8127 or 16254 (up from 100 or 200 respectively) seems appropriately big for an indie game receiving an update relatively late after launch on a console with a limited install base. (Assuming weekly)