Solve the problem.A retired couple has $170,000 to invest to obtain annual income. They want some of it invested in safe Certificates of Deposit yielding 6%. The rest they want to invest in AA bonds yielding 11% per year. How much should they invest in each to realize exactly $16,700 per year?
A. $140,000 at 11% and $30,000 at 6%
B. $120,000 at 6% and $50,000 at 11%
C. $130,000 at 6% and $40,000 at 11%
D. $130,000 at 11% and $40,000 at 6%
Answer: D
Mathematics
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Use Cramer's rule to solve the system. 4x + 4z = 40-7x + 5y + 6z = 64-2x - 2y = -16
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