For example, consider a fund opening with just $100 of a single stock that is sold for $110 during the day. During the same day, another stock is purchased for $110, closing with a value of $120. The returns on each stock are 10% and 120/110 - 1 = 9.0909% (4 d.p.) and the portfolio return is 20%. The asset weights "wi" (as opposed to the time weights "Wi") required to get the returns for these two assets to roll up to the portfolio return are 1200% for the first stock and a negative 1100% for the second: