This is fine don't worry. You don't take the average key price for the day, you are supposed to take the average key price for 7 days, the price on the day it happened, the price of the three days before, and the price of the three days after. Since we don't know what keys will be in the next three days I am counting them as 1.75 each. So 1.75+1.75+1.75+1.75+1.75+1.80+1.81 = 12.36/7 = 1.76ish keys! And another thing, you are supposed to round given guidelines and that's what I'm doing here, for unusuals ranging from 200-1000 keys the price is supposed to round to the nearest 10 keys so yeah!