Solve.Melissa invested a sum of money at 3% annual interest. She invested three times that sum at 5% annual interest. If her total yearly interest from both investments was $5400, how much was invested at 3%?
A. $22,500
B. $202,500
C. $30,000
D. $67,500
Answer: C
Mathematics
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A. 
+ 
B. 
+ 
C. 
+ 
D. 
+ 
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Find domain of the following function.
?
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