SOLUTION: Growth and decay. In march, yoda invested $1500 into the stock market. In December his stock portfolio was worth $5200. What was the monthly rate of change in his portfolio?

Question 389816: Growth and decay.
In march, yoda invested $1500 into the stock market. In December his stock portfolio was worth $5200. What was the monthly rate of change in his portfolio?
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
I will assume that YOU invested $1500 AT THE BEGINNING of the month of March, and that at the END of December, YOUR stock portfolio has worth $5200. So that's after 10 months. YOUR portfolio's monthly rate of change r is then computed as follows:

==> , to 4 decimal places.
That is 13.24% per month.
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