? What single decimal multiplier would you use to increase by 5% followed by a 15% increase?
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This result is consistent with the social behavior known as "reciprocity". 

Reciprocity in social psychology refers to a social standard of reacting to a positive activity with another positive activity, remunerating kind activities. As a social build, correspondence implies that in light of cordial activities, individuals are as often as possible more pleasant and considerably more helpful than anticipated by the self-interest model.