Answer: 8.92%
Step-by-step explanation:
The interest rate that would make Randy indifferent is the one that will discount the twenty payments of $325,000 to $3,500,000 today.
Use Excel's Rate function to find this rate;
=RATE (No of periods, annual payments, present value, future value, Annuity due = 1)
=RATE(20,350000,-3500000,0,1)
= 8.92%