You could make it work mathematically: the added 50% would need to be based on the initial price and not a modification on the adjusted price.
It’s most logically interpreted as: x * 1.5 * 0.5 = 0.75x
But we could see it as: x - (x/2) + (x/2) = x
I’m equally fun at parties.
I cannot be 100% certain but I’m confident I was using it not long after the 1.0 release. That’d put me at 2004. 19 years!
Although I did briefly switch over to Chrome when it was new and fast. Then switched back when Firefox had a major optimization pass.