10%
15%
15.6%
18.5%
Correct answer is D
\(\% increase = \frac{Increase}{initial\hspace{1mm} salary}\times 100\%\\
Increase=N3,200 - N2,700 = N500\\
Initial \hspace{1mm} salary=N2,700.00=\frac{N500}{N2,700}\times 100\% = 18.5\%\)
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