Super Gain Tax =LKR 27bn
Market PER= 20 PER
Impact to Market Capitalisation:
LKR 27Bn X 20 PER
LKR 540 billion
You can also calculate the expected fall:
Current market cap = LKR 3,000 Billion
Impact: LKR 540 Billion
% Impact = 540/3000
18%
Market should fall By 18%
Current Market ASI : 7200
Expected Fall: 1296 Points
Final ASI after adjustment : 6000
If we take a market PER of 10, then the market should fall 648 Points (ASI 6728) as a result of this tax.
(This is a theoretical calculation and therefore please do not find fault with me if it does not fall to 6000)