1.) I left a multiple of 0.2 in the integral.
2.) I mis-interpetated Erica's answer. I mistakenly thought that she w=
as
cubing her interest rate and not just saying that 1/(1+i) and .75 are
equivalent.
3.) I tried to correct a group of obviously very intelligent students!=
Actually, I made a 4th mistake: I had three actuaries and two
near-actuaries review my answer and they agreed with it. Isn't that
scary!!
=