SOLUTION: my question is sn=800 r=1.2 a=10 how to find n?

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Question 210038: my question is sn=800 r=1.2 a=10 how to find n?
Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
You gave us the value of [a] but that letter is not found in the equation.
Where is your letter [a] in the equation?