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[latex]percent \ increase= \frac{new \ value-old \ value}{old \ value} \times 100 \% \\ = \frac{90-50}{50} \times 100 \% \\ = \frac{40}{50} \times 100 \% \\ =80\%[/latex]
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[latex]percent \ increase= \frac{new \ value-old \ value}{old \ value} \times 100 \% \\ = \frac{90-50}{50} \times 100 \% \\ = \frac{40}{50} \times 100 \% \\ =80\%[/latex]