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I'm doing the calculation to find out the period, my HP12C Gold model C1GP330, responds with a value of 15, but the correct value is 14. When the calculation is performed on the virtual HP12C, the same calculation generates the answer 14!!! 

How to solve this?

 

Pv= -78,000.00

 

Fv= 110,211.96

 

i = 2.5

 

N = ?

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