Recently, a financial calculation question about counterfeit banknotes has sparked heated discussions on the Internet! The title describes the dilemma of a shoe seller, Xiao Li, who encounters counterfeit banknotes and asks to calculate the amount of money he eventually loses. This seemingly simple question made 90% of the participants miscalculate!

Reenactment:

Xiao Li's shoes are priced at 20 yuan, the price is 30 yuan, the guest buys with 50 yuan counterfeit banknotes, Xiao Li gives change 20 yuan to the guest and later finds out that it is a counterfeit banknote, and compensates the neighbor 50 yuan Most people's first reaction is: the cost of the shoes is 20 yuan, plus 20 yuan for change, plus 50 yuan for the neighbor, and the wrong conclusion of 90 yuan

Correct Answer Analysis:

Xiao Li's actual loss is only 50 yuan! The specific composition is as follows:

Direct loss of $20 (cost of shoes)

Opportunity cost: $30 (profit that should have been earned)

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