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Answer:
Let's denote the man's monthly income as x.
The amount he saves, which is 18% of his monthly income, can be expressed as 0.18x.
Given that he saves $3780 per month, we can set up the equation:
0.18x = 3780
Now, we can solve for x:
x = \frac{3780}{0.18}
x = 21000
Therefore, his monthly income is $21,000.