c * 3 * d = z
c = corpses delivered daily
d = days per month
z = zombies fed per month
100 * 3 * 30 = 9,000
If your months are less than 30 days, then it will be 300 less zombies fed per day. (29 days is 8700, 28 days is 8400, etc.) Likewise, each extra day is 300 more zombies fed.
c * 3 * d = z
c = corpses delivered daily
d = days per month
z = zombies fed per month
100 * 3 * 30 = 9,000
If your months are less than 30 days, then it will be 300 less zombies fed per day. (29 days is 8700, 28 days is 8400, etc.) Likewise, each extra day is 300 more zombies fed.