Ms. Clark earned $29,600 in her third year as a banker and $32,600 in her seventh year. How much did she make in her tenth year? Assume that her yearly salaries form an arithmetic sequence.

Her salary increased by $32,600 − $29,600 = $3,000 over four years, so the yearly increase was $3,000 ÷ 4 = $750. From her seventh year to her tenth year is three years, adding 3 × $750 = $2,250 to $32,600. She made $34,850 in her tenth year, choice B.

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