There is exactly $10,000 in a trust fund that is to be invested among three types of bonds, A, B, and C, which yield 5%, 6%, and 7%, respectively, on the investment. The total yield must be at least $600, no less than $3000 may be invested in B bonds, and no more than $2000 may be invested in A bonds.If x and y represent the amounts invested in A and B bonds, then the maximum possible yield is
A. $670.
B. $700.
C. $600.
D. $630.
E. none of these
Answer: A
Mathematics
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A. 
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Mathematics