What are the specific methods for replacing methionine with 98% betaine hydrochloride?

The price of methionine remains high, and betaine can replace part of the methionine, but how exactly do you calculate it? For example, suppose 5% methionine is added to the feed, and now 20% is replaced, 5 x 20% = 1%, so should the current formula be 4% methionine + how much betaine hydrochloride?
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I'd also like to know about this, so I'll bump it for you.
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Bumping it up, hoping an experienced expert can give some guidance!
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Hehe! Search online and there's a relevant optimal ratio! We're doing it this way now! The effect is better than using methionine entirely