Solve.The amount of simple interest earned on an investment over a fixed amount of time is jointly proportional to the principle invested and the interest rate. A principle investment of $4600.00 with an interest rate of 1% earned $230.00 in simple interest. Find the amount of simple interest earned if the principle is $3900.00 and the interest rate is 4%.
A. $195.00
B. $78,000.00
C. $920.00
D. $780.00
Answer: D
Mathematics
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A. 
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C. x 
D. 
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Find the maximum value of 
subject to:
What will be an ideal response?
Mathematics