This percentage is just a metric of the appreciation or depreciation compared to the price 24 hours ago. If it was at 1 dollar yesterday and today it is at 2 dollars, it was 100% in 24 hours.

I bought the currency -7.29% and its appreciation went to 8.43%, that is, it went up 15% and my balance remains the same. I don't understand this logic behind the appreciation percentages.
Can anyone explain it?