Bob and Jack share an apartment. If each month Bob pays a dollars and Jack pays ...【小站备考】

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Bob and Jack share an apartment. If each month Bob pays a dollars and Jack pays b dollars, what percent of the total cost does Bob pay?

A. $\frac{a}{b}%$

B. $\frac{b}{a}%$

C. $\frac{a}{a+b}%$

D. $100\frac{a}{b}%$

E. $100\frac{a}{a+b}%$

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