Solve the problem.Walt made an extra $10,000 last year from a part-time job. He invested part of the money at 6% and the rest at 9%. He made a total of $720 in interest. How much did he invest at each rate?
A. $4000 at 9%; $6000 at 6%
B. $5000 at 9%; $6000 at 6%
C. $4000 at 9%; $8000 at 6%
D. $6000 at 9%; $4000 at 6%
Answer: A
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