For each month of a given year except December, a worker earned the same monthly salary and donated one-tenth of that

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For each month of a given year except December, a worker earned the same monthly salary and donated one-tenth of that salary to charity. In December, the worker earned \(N\) times his usual monthly salary and donated one-fifth of his earnings to charity. If the worker's charitable contributions totaled one-eighth of his earnings for the entire year, what is the value of \(N?\)

A) \(\dfrac85\)

B) \(\dfrac52\)

C) \(3\)

D) \(\dfrac{11}3\)

E) \(4\)

Answer: D

Source: Manhattan GMAT
Source: — Problem Solving |