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

Manhattan Prep

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. 8/5
B. 5/2
C. 3
D. 11/3
E. 4

OA D

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