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, which of the following inequalities must be satisfied?
A. 0.05x + 0.06y ? 600
B. 2x + y ? 1000
C. y ? 3000
D. x + y ? 5000
E. none of these
Answer: B
Mathematics
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