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Employees before July 1st: \(100\)

Total salary before july 1st: \(T_b\)

Average before July 1st: \(\frac{T_b}{100}\)

Employees after July 1st: \(90\)

Total salary after july 1st: \(T_a\)

Average after July 1st: \(\frac{T_a}{90}\)

\(\frac{T_a}{90} = 1.1*\frac{T_b}{100}\)

\(\frac{T_a}{T_b} = 1.1*\frac{90}{100} = \frac{9.9}{10} = \frac{99}{100} = 0.99 = 99%\)

Ans: "B""

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