Intrinsic value/annual return/discount rate

Hi,
What is the formula to find the annual return?
Any help? A bit stuck

The intrinsic value per share is $137.33 at a 6.61% annual discount rate

Based on the cash flows you have forecasted and a market price of $90.52, this company may yield a 8.37% annual return

perpetuity growth rate is 2,5%