The "return formula" in the cryptocurrency circle:

If the price drops by 10%, it will return to its original cost if it rises by 11.1%.

If the price drops by 20%, it will return to its original cost if it rises by 25%.

If the price drops by 30%, it will return to its original cost if it rises by 42.8%.

If the price drops by 40%, it will return to its original cost if it rises by 66.7%.

If the price drops by 50%, it will return to its original cost if it rises by 100%.