Hi all,
This one has stumped me and I can't find the answer online.
I need to sum a series that increases by a percentage each period. However, the percentage it increases depends on the number of periods. I.e., if it needs to increase from 80K to 100K over 3 years, the annual percentage increase would be 7.72%; but if it needs to increase from 80K to 100K over 4 years, the annual percentage increase would be 5.74%.
What I need is a formula that can take this variability into account while summing the total of series for the given period. E.g., I know that the answer for the 3 year example given above is 259,009 (80,000 for period 1 + 86,177 for period 2 + 92,832 for period 3), but I don't know how to get it into a single formula (which I need, given the variability explained above).
To be clear, I will always know the beginning and end points (80K and 100K in the example above), the number of periods, and the percentage increase. What I need is the sum of the amounts for each period, as explained above.
I'm sure there's a math equation I learned in high school that I'm forgetting here. Can anyone help?
This one has stumped me and I can't find the answer online.
I need to sum a series that increases by a percentage each period. However, the percentage it increases depends on the number of periods. I.e., if it needs to increase from 80K to 100K over 3 years, the annual percentage increase would be 7.72%; but if it needs to increase from 80K to 100K over 4 years, the annual percentage increase would be 5.74%.
What I need is a formula that can take this variability into account while summing the total of series for the given period. E.g., I know that the answer for the 3 year example given above is 259,009 (80,000 for period 1 + 86,177 for period 2 + 92,832 for period 3), but I don't know how to get it into a single formula (which I need, given the variability explained above).
To be clear, I will always know the beginning and end points (80K and 100K in the example above), the number of periods, and the percentage increase. What I need is the sum of the amounts for each period, as explained above.
I'm sure there's a math equation I learned in high school that I'm forgetting here. Can anyone help?