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Let's break down the problem:

- Edmund earned **$900 more** this month compared to last month.
- The increase of $900 represents an **18% increase** from what he earned last month.

Let $ x $ be the amount Edmund earned last month. Then:

\[
\text{Amount earned this month} = x + 900
\]

Since this is an 18% increase from last month’s earnings:

\[
x + 900 = 1.18x
\]

Now, let's solve for $ x $.

\[
x + 900 = 1.18x
\]

Subtract $ x $ from both sides:

\[
900 = 0.18x
\]

Now, divide both sides by 0.18:

\[
x = \frac{900}{0.18} = 5000
\]

So, Edmund earned **$5000** last month.

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

Here are 5 questions based on this:
1. How much did Edmund earn this month?
2. If Edmund's earnings increase by 10% next month, how much will he earn?
3. What would be the total percentage increase in his earnings over two months?
4. If Edmund saved 25% of his last month’s earnings, how much did he save?
5. If Edmund had earned $600 more instead of $900, what would his last month’s earnings have been?

**Tip:** When dealing with percentage increases, remember that the new amount is the original amount plus the increase (expressed as a decimal).

This month, Edmund earned $900 more money than he earned last month. This is an 18% increase from the money he earned last month. How much money did he earn last month?

Solve how much Edmund earned last month given a percentage increase of 18% and an additional $900 in earnings this month. A step-by-step solution covering algebraic concepts and percentage increase calculations. Suitable for Grades 9-10 students.

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