A salesperson is paid a flat rate plus a fixed percentage of her sales. Last month, she sold $16,000 worth of goods and was paid $1,600. Two months ago, she had $12,000 in sales and was paid $1,400. This month she sold $11,000 worth of goods. How much will she be paid?

The salesperson’s pay increases by $200 when sales increase by $4,000, so the commission rate is $200 ÷ $4,000 = 5%. At $16,000 in sales, a 5% commission is $800, meaning the flat rate is $1,600 − $800 = $800. For $11,000 in sales, her pay is $800 + 5% of $11,000 = $1,350, so the correct choice is D, $1,350.

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