Answer: His total income for that week is $254.
Explanation:
Since we have given that
Amount he earned per week working at a clothing store = $200
Rate of commission on all of his sales = 3%
His total sales = $1800
So, Amount earned from commission is given by

So, Total income for that week would be
$200+$54=$254.
Hence, his total income for that week is $254.