Solve the problem.A retired couple has $140,000 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 10% per year. How much should they invest in each to realize exactly $12,000 per year?
A. $80,000 at 6% and $60,000 at 10%
B. $90,000 at 10% and $50,000 at 6%
C. $90,000 at 6% and $50,000 at 10%
D. $100,000 at 10% and $40,000 at 6%
Answer: B
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sin 
- cos 
sin 
A. 
B. 
C. 
D. 1
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