Sally earns graduated commission on her sales each month. She earns 6% commission on the first $45,000 in sales and 8% on anything over that. If Sally had $51,000 in sales this month, how much commission did she earn?

Sally earns 6% on the first $45,000: 0.06 × $45,000 = $2,700. The remaining $6,000 earns 8%: 0.08 × $6,000 = $480. Her total commission is $2,700 + $480 = $3,180, so the correct choice is B, $3,180.

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