SOLUTION: What is the annual interest rate if $7200 is invested for 15 months and earns $855 interest?

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Question 489276: What is the annual interest rate if $7200 is invested for 15 months and earns $855 interest?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
855=7200*r*15/12
855/(7200*15/12)=r
855/9000=0.095=9.5%