Brain teasers are a fun and engaging way to challenge your thinking and problem-solving skills. They often present scenarios that require logical reasoning, creativity, and sometimes a bit of lateral thinking. One viral brain teaser that has captivated many involves a store, a product, and a seemingly simple question: How much money did the store lose? In this article, we’ll explore the intricacies of this brain teaser, break down the scenario, and guide you through the process of finding the solution.

The Scenario
Imagine a store that sells a particular product for 100.Oneday,acustomerwalksintothestoreandbuysthatproduct.Tomakethepurchase,thecustomerhandsthecashiera100. One day, a customer walks into the store and buys that product. To make the purchase, the customer hands the cashier a 100.Oneday,acustomerwalksintothestoreandbuysthatproduct.Tomakethepurchase,thecustomerhandsthecashiera100 bill. The cashier, in a hurry, accidentally gives the customer 110inchangeinsteadof110 in change instead of 110inchangeinsteadof0.

After realizing the mistake, the store owner is left wondering how much money the store actually lost in this transaction. Was it just the $10 in extra change, or is there more to the story?

Breaking Down the Problem
To solve this brain teaser, we need to analyze the transaction step-by-step. Let’s break it down into parts:

Step 1: The Sale
The customer pays $100 for the product.
The store receives $100 in cash.
At this stage, the store has made a sale and has $100 in cash.

Step 2: The Change Given
The cashier mistakenly gives the customer $110 in change.
Now, let’s consider how much cash the store has after this mistake:

The store initially had $100 from the sale.
After giving the customer 110inchange,thestoreisnowdown110 in change, the store is now down 110inchange,thestoreisnowdown110
Step 3: Calculating the Financial Impact
To understand the overall financial impact of this transaction, we need to consider both the sale and the change given:

The store received 100butthengaveaway100 but then gave away 100butthengaveaway110.
Therefore, the net cash flow for the store from this transaction is:
Net Cash Flow=Cash Received−Cash Given=100−110=−10\text{Net Cash Flow} = \text{Cash Received} – \text{Cash Given} = 100 – 110 = -10Net Cash Flow=Cash Received−Cash Given=100−110=−10
This indicates that the store has lost $10 in cash.

Step 4: The Value of the Product
Now, it’s crucial to consider that the customer also took the product, which has a value of $100. This means we need to factor in the cost of the product to determine the total loss to the store:

The store lost $10 in cash.
The store also lost the $100 product.
Total Loss Calculation
To calculate the total loss:

Cash loss: $10
Value of the product: $100
Thus, the total loss can be expressed as:

Total Loss=Cash Loss+Value of Product=10+100=110\text{Total Loss} = \text{Cash Loss} + \text{Value of Product} = 10 + 100 = 110Total Loss=Cash Loss+Value of Product=10+100=110
So, the store’s total loss from this transaction amounts to $110.

The Trick Behind the Teaser
This brain teaser plays on the simplicity of the situation while hiding the complexity of what constitutes a loss. Many people might initially jump to the conclusion that the store only lost $10 due to the error in change. However, by considering the value of the product taken by