Doris invested some money at 7% and some money at 8%. She invested $4,000 more at 8% than she did at 7%. Her total yearly interest from the two investments was $920. How much did Doris invest at each rate?
A. $100 at 7%, $7,900 at 8%
B. $5,000 at 7%, $8,000 at 8%
C. $4,000 at 7%, $9,000 at 8%
D. $4,000 at 7%, $8,000 at 8%
E. $4,500 at 7%, $7,500 at 8%
Answer: D
Mathematics
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