Question 439165
Let r = 5% with interest compounded monthly (m = 13) for t = 5 years.
==> i = r/m = 0.05/13 = 0.003846, and 

n = mt = 13*5 = 65.
Then fv = 100, and so 

{{{pv = fv*(1/(1+i)^n) = 100*(1/(1.003846)^65) = 77.92}}}