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Who earns what on a USD 100 credit card payment in the US
The prompt
A shopper in the US pays USD 100 with a rewards credit card. The merchant pays a merchant discount rate of 2.5 percent. Interchange is 1.8 percent and scheme fees are 0.15 percent of the sale. The acquirer's processing and support cost is USD 0.20. The issuer gives 1 percent back to the shopper as rewards, loses about USD 0.10 to fraud, and spends USD 0.15 on processing. How much does each party keep?
Your interviewer will share data as you ask for it. Ask clarifying questions, state a hypothesis, then lay out your structure out loud before you calculate.
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