Answer:
3.12%
Explanation:
We use formula in excel to calculate annual rate of return
Rate = (Nper,PMT,,FV,1)
Nper (number of payments): 30
PMT (payment made every period) : -$20,000
FV (future value of investment): $1,000,000
type 1 for payment beginning of period
Then rate = (30,-20000,,1000000,1)= 3.12%
Please see excel attached for the calculation