21. In 2015, John earned $40,000 at his job at an accounting firm. This year, he receives a $2,000 increase in his salary. If the annual inflation rate for 2016 is 0.4%, the percentage increase in his real income is:
(A) \( 5.4\% \)
(B) \( 4.6\% \)
(C) \( 2.0\% \)
(D) \( 1.4\% \)

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