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To solve for the unknown quantity in this percentage problem, we use the formula:

\[
R \cdot B = A
\]

where:
- \( R \) is the rate (in decimal form),
- \( B \) is the base (the unknown value we’re solving for),
- \( A \) is the amount.

Given in the problem:
- \( A = 73 \)
- \( R = 81\% = 0.81 \)

### Step-by-Step Solution:

1. Substitute the known values into the formula:

   \[
   0.81 \cdot B = 73
   \]

2. Solve for \( B \) by dividing both sides by 0.81:

   \[
   B = \frac{73}{0.81}
   \]

3. Calculate the value of \( B \):

   \[
   B \approx 90.12
   \]

### Answer:
The unknown quantity is approximately **90.12**.

Would you like further details or have any questions about this solution?

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**Related Questions:**
1. How do you convert a percentage into decimal form?
2. What is the formula to find the base when given a percentage and an amount?
3. How do you determine if rounding to two decimal places is necessary?
4. Can you explain how to find the percentage rate if the base and amount are given?
5. What are some real-life applications of this percentage calculation?

**Tip:** Always convert percentages to decimals (e.g., 81% becomes 0.81) to simplify calculations.

Find the unknown quantity in the following percent problem using the formula R * B = A. Round your answer to two decimal places, if necessary.
73 is 81% of ___.

Learn how to solve a percentage problem where 73 is 81% of an unknown value. Using the formula R * B = A, this solution provides step-by-step calculations, rounding to two decimal places as needed. Ideal for students in Grades 7-9.

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