Michell has a monthly salary of $1,800 and also earns 6% commission on sales. If Michell had $37,000 in sales last month, what were Michell’s total earnings for the month?

Michell’s commission was 6% of $37,000: 0.06 × $37,000 = $2,220. Add the $1,800 salary to get total earnings of $4,020, so the correct choice is $4,020.

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