Step 1: The T.V.'s marked price is \( 24000/0.4 = ₹60000 \), so its selling price is \( 60000-24000=₹36000 \), and at \( 20\% \) profit its cost price is \( 36000/1.2=₹30000 \).
Step 2: The Cooler sells for half the T.V.'s cost price, i.e. ₹15000, and at \( 10\% \) profit its cost price is \( X = 15000/1.1 = ₹13636.36 \).
Step 3: The A.C. sells for \( 30000/0.6=₹50000 \), so the Laptop sells for \( 50000 \times 1.5=₹75000 \), and at \( 20\% \) profit its cost price is \( 75000/1.2=₹62500 \), giving a profit of \( Y = 75000-62500=₹12500 \).
Step 4: Since \( 13636.36 \gt 12500 \), \[ \boxed{X \gt Y} \]