Short-side break-even

For an intraday short (sell $Q$ at $P$ first, buy back at $P - \Delta$), STT is charged on the opening (sell) leg and stamp duty on the closing (buy) leg. Using the notation of (1.3), derive the break-even $\Delta^*_{\text{short}}$ and compare it with the long break-even (1.4) for $P = \text{₹}1{,}500$, $Q = 100$. Which is larger, and why is the difference so small?