Answer:
$810 in commission
Step-by-step explanation:
1. Make a proportion. Method: Percent proportion

2. your proportion should look like this. Note: we don't know how much commission he earned.
3. cross-multiply. Multiply 9 x 9000 and make 100x because we don't know its value yet. Hint: X is our unknown commission.
×
=
4. set your new proportion.

5. divide the proportion by 100 on each side.

6. After dividing your proportion.
$

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