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For Question 23, which asks about the number of books sold and the percentage changes from Thursday to Sunday, let’s analyze the data provided:

You are given the percentage change in the number of books sold over four days:
- Thursday: (no specific percentage change is mentioned for Thursday, so we assume it's the baseline).
- Friday: -25%
- Saturday: +50%
- Sunday: -16%

Additionally, it is stated that the number of books sold on Sunday was 66 less than the number sold on Thursday. The task is to find how many books were sold on Thursday.

### Let's break it down:
1. Let the number of books sold on Thursday be denoted by \( x \).
2. The number of books sold on Friday was \( x \times (1 - 0.25) = 0.75x \).
3. The number of books sold on Saturday was \( 0.75x \times (1 + 0.50) = 1.125x \).
4. The number of books sold on Sunday was \( 1.125x \times (1 - 0.16) = 0.945x \).

You are told that the number of books sold on Sunday was 66 less than on Thursday:
\[
0.945x = x - 66
\]
Simplifying this equation:
\[
x - 0.945x = 66
\]
\[
0.055x = 66
\]
\[
x = \frac{66}{0.055} = 1200
\]

Thus, **1,200 books were sold on Thursday**.

Would you like to see the solutions for the remaining questions or need further clarification on this problem? 

Here are five related questions you might find useful:
1. If 1,200 books were sold on Thursday, how many books were sold on Saturday?
2. What would be the total number of books sold from Thursday to Sunday?
3. How would the calculations change if Sunday had a percentage increase instead of a decrease?
4. If the number of books sold on Friday had decreased by 30% instead of 25%, how would that affect the answer?
5. How can you express the percentage decrease from Thursday to Sunday in terms of books sold?

**Tip**: Always make sure to set your baseline (like the number of books on Thursday) before calculating percentage changes over time.

The table below shows the percentage changes in the number of books sold in a bookstore from Thursday to Sunday. If the number of books sold on Sunday was 66 less than on Thursday, find the number of books sold on Thursday.

Solve a real-world problem involving percentage changes in book sales from Thursday to Sunday. Learn how to calculate the number of books sold on Thursday using percentage change and algebraic methods. Suitable for Grades 9-11.

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