Square-root impact, capacity and splitting

A stock has $V_D = 20$ lakh shares and $\sigma_D = 1.5\%$; take $Y = 0.8$ in (5.13). (a) Compute the predicted impact in bp for metaorders of 10,000, 50,000, 1 lakh and 2 lakh shares. (b) A strategy's gross edge per trade is 30 bp. Ignoring other costs, at what order size does impact consume the edge? (c) Compare executing $Q$ in one day with executing $Q/2$ on each of two days (same $V_D$, $\sigma_D$, and assuming impact fully decays overnight). What fraction of the impact cost is saved, and what risk is added?