I'm not sure I follow all the arithmetic here (I'm pretty sure that, at fixed margin, revenue would only need to increase by 3x to increase earnings by 3x), but I did follow up to see what Berkshire had paid for Coca-Cola.

This thoughtful Quora post claims that Buffett made his first purchase of KO at a P/E of 29.

https://www.quora.com/What-was-the-P-E-Buffett-paid-for-Coca...