Solve Using a System of Two Equations in Two Unknowns

Multiple Choice

Solve using a system of two equations in two unknowns.
-A retired couple has $150,000 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 12% per
Year. How much should they invest in each to realize exactly $15,000 per year?

A) $100,000 at 6% and $50,000 at 12%
B) $90,000 at 6% and $60,000 at 12%
C) $100,000 at 12% and $50,000 at 6%
D) $110,000 at 12% and $40,000 at 6%