Solve.Melissa invested a sum of money at 3% annual simple interest. She invested three times that sum at 5% annual simple interest. If her total yearly interest from both investments was $3600, how much was invested at 3%?
A. $45,000
B. $135,000
C. $20,000
D. $15,000
Answer: C
Mathematics
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A. 
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C. 
D. 
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- 6
- 7
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