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It looks like your question involves finding a previous amount of sales based on a percentage increase. Let's go through the problem in detail.

The problem says:
- There is a 40% increase in sales today compared to yesterday.
- Today's sales amount to $7,000.
- We need to find out what yesterday's sales were.

### Approach:
Let the sales from yesterday be $ X $. Since today’s sales are a 40% increase from yesterday, this means:
\[
\text{Today's sales} = X + 0.40X = 1.40X
\]
We are given that today’s sales are $7,000, so:
\[
1.40X = 7,000
\]
Solving for $ X $:
\[
X = \frac{7,000}{1.40} = 5,000
\]

So, yesterday’s sales were **$5,000**.

Would you like more details on the process, or do you have any questions? 

Here are 5 related questions for practice:
1. If the increase in sales was 50% instead of 40%, what would yesterday's sales have been?
2. What would today's sales be if yesterday's sales were $5,000 and there was a 60% increase?
3. If yesterday’s sales were $6,000, what would today's sales be with a 40% increase?
4. How would the formula change if there was a 30% decrease in sales instead of an increase?
5. How can you use the same method to find the original price of a product after a percentage discount?

### Tip:
When dealing with percentage increases or decreases, always set up an equation where the percentage is applied to the original amount, and then solve for the original value.

A seller has an increase of 40% in sale today compared to yesterday. The sale today amounts to $7,000. How much was the amount of sale yesterday?

Learn how to calculate the sales from yesterday based on today's sales of $7,000 and a 40% increase. This problem demonstrates how to apply percentage increase formulas in real-world situations. Suitable for students in Grades 6-8.

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