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In step 4, Mike made an error.
The correct equation to determine the money earned if they sell more than 10 books is:
m = 2(b) + 4, where b represents the number of books sold and m represents the money earned.
In step 4, Mike incorrectly used the equation: m = 2(22 + 4).
The correct equation for Mike's case would have been: m = 2(22) + 4.
Therefore, the answer is D. Step 4.