Need help writing formula to calculate monthly returns based on annual growth rate

[bxk006]

Everyone,

I have a model that makes projections based on annual growth rates. However, I need to evaluate the data based on monthly intervals. With an 8% return on an investment of $1,000,000 my ending balance at the end of the year should be $1,080,000 and in year 2 it would be $1,166,400 and so on. In order to evaluate the monthly data I need each month in year 1 to be based off $1,000,000, so it would be 8%/12=.006666% or $6,666.66 per month. The next year would be based off $1,000,000 + (6,666.66*12) = $1,080,000 and each month would be $7,200.

I need help writing a formula to evaluate over 360 periods. Workbook attached. Thanks!