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The problem presents the following equation for the total cost $ C $, based on the number of pages sent or received $ p $:

\[
C = 0.06p + 7.5
\]

Where:
- $ C $ is the total cost in dollars.
- $ p $ is the number of pages sent or received beyond the 100 free pages.
- 7.5 represents the base subscription fee, and 0.06 is the overage charge per page after exceeding 100 pages.

We are given that the total monthly bill is $9.96 and need to find how many pages were sent or received.

### Step-by-step solution:
1. Start with the given equation for total cost:
   \[
   C = 0.06p + 7.5
   \]
2. Substitute the total cost $ C = 9.96 $ into the equation:
   \[
   9.96 = 0.06p + 7.5
   \]
3. Subtract 7.5 from both sides to isolate the term involving $ p $:
   \[
   9.96 - 7.5 = 0.06p
   \]
   \[
   2.46 = 0.06p
   \]
4. Divide both sides by 0.06 to solve for $ p $:
   \[
   p = \frac{2.46}{0.06} = 41
   \]

So, the number of pages beyond the 100 free pages is 41.

### Total number of pages:
Since 41 pages were charged beyond the free 100 pages, the total number of pages sent or received is:
\[
100 + 41 = 141
\]

Thus, the total number of pages sent or received is **141**.

---

Would you like more details on any of these steps? Here are 5 related questions you might find interesting:

1. How would the total cost change if the overage charge increased to $0.08 per page?
2. If a user sends exactly 150 pages, how much would the total cost be?
3. What would happen to the cost if no pages beyond the free limit were sent?
4. How can you calculate the number of pages if you know the total bill without overage fees?
5. How would the equation change if the subscription fee increased to $10 per month?

**Tip**: When solving equations, always remember to isolate the variable by performing inverse operations step by step.

An online fax company, EFaxIt.com, has a customer plan where a subscriber pays a monthly subscription fee of $7.50 and can send/receive 100 fax pages at no additional cost. For each page sent or received past the 100-page limit, the customer must pay an overage fee of $0.06 per page. The following expression gives the total cost, in dollars, to send or receive p pages beyond the plan's monthly limit: C = 0.06p + 7.5. If the monthly bill under this plan comes out to be $9.96, what was the total number of pages sent or received?

This problem involves solving a linear equation to determine the total number of fax pages sent or received under a subscription plan. It covers key algebra concepts like linear equations, suitable for students in grades 7-9.

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