COLLEGE ALGEBRA
posted by JOE .
Sue, a recent retiree, requires $6,000 per year in extra income. She has $50,000 to invest and can invest in Brated bonds paying 15% per year or in a certificate of deposit (CD) paying 7% per year. How much money should be invested in each to realize exactly $6,000 in interest per year?

Never mind the algebra. Where can I get that 7% CD?
Seriously, solve this equation:
0.15x + 0.07(50,000x) = 6000
x is the amount invested in 15% bonds.
50,000 x is invested in the CD.
The equation can easily be solved in two steps. 
Sue, a recent retiree, requires $6,000 per year in extra income. She has $50,000 to invest and can invest in Brated bonds paying 15% per year or in a certificate of deposit (CD) paying 7% per year. How much money should be invested in each to realize exactly $6,000 in interest per year?
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