Understand the idea
A percentage gain needed to recover a loss is measured from the smaller remaining amount. Equal percentage losses and gains do not cancel.
Put it into practice
Start with 100 units, lose 20% to reach 80, then calculate that gaining 20 units from 80 requires a 25% increase.
Know the limits
This arithmetic describes a balance change; it does not provide a strategy for achieving that increase.
The wider context
These guides use arithmetic to explain uncertainty, not to forecast earnings. A hypothetical multiplier is an assumption, not a promise. Real rules, fees, eligibility and outcomes differ. Practice credits have no cash value, and a worked example should never be treated as a reason to risk essential money.
Your next step
Use the practical step above only where it fits your situation. Before an account-specific action, check the current instructions from the service or device provider involved. Write down what you observed and what remains uncertain; that makes a follow-up question more useful.