SOLUTION: A man has $20,000 invested at 7% and %50,000 invested at 4% simple interest. What additional sum must he invest at 6% to give him an overall return of 5%?

Question 128549: A man has $20,000 invested at 7% and %50,000 invested at 4% simple interest. What additional sum must he invest at 6% to give him an overall return of 5%?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
overall percent gain = (sum of separate gains) / (total amount invested)

multiply both sides by

He must invest $10,000 at 6% to have an overall return of 5%

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