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Technically he would have to charge $15… If he would add 50% to the initial $20.
Yes, I’m a lot of fun at parties
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) = xI’m equally fun at parties.