Bill plans to retire in 17 years. He currently has saved up $200,000, and he believes he will need $1,000,000 at retirement. What annual interest rate must Bill earn to reach his goal, assuming he does not save any additional funds between now and retirement?

a. 20.00%

b. 4.71%

c. 1.18%

d. 23.53%

e. 9.93%