Answer :

naǫ
x - the percent increase

[tex]25+25x=35 \ \ \ |-25 \\ 25x=10 \ \ \ |\div 25 \\ x=\frac{10}{25} \\ \Downarrow \\ x=\frac{10}{25}=\frac{10 \times 4}{25 \times 4}=\frac{40}{100}=40\%[/tex]

The answer is C. 40% increase.

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