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-fourth 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?
Select the correct option:	A) 8/5	B) 5/2	C) 3	D) 22/10	E) 4
Let monthly salary for each of the 11 months except 22/10ecember was x, then   11x*1/10 + Nx*1/4 = 1/8(11x + Nx);   11/10 + N/4 = 1/8(11 + N) =&gt; 44+10N/40= 11+N/8   352+80N = 440+40N =&gt; 40N = 88   N =88/40 =22/10   Answer: 22/10.
<result>D</result>
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-fourth 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?