Informer reward percentage is:

The concept of an informer reward is to incentivize individuals to provide critical information that aids law enforcement. A reward percentage needs to be substantial enough to motivate potential informers without being fiscally irresponsible. 10% is a commonly adopted percentage in many jurisdictions for informer rewards. This figure is considered a fair balance, offering a significant incentive for valuable information that leads to successful outcomes. A 5% reward might be too low to be a strong motivator, whereas 15% or 20% could be deemed excessively high, potentially straining public funds or creating unintended incentives.