solution
payment, p=500 is paid monthly in perpetuity and present value, pv=10000
These represents a series of payments beginning at time 0, i.e annuity in advance
present value=p∗i1+i
Where i is the monthly compounding rate
10000=500∗i1+i20=i1+ii=191=5.2632%
Answer
The nominal annual discount rate:
(5.2632%)∗12=63.1579%
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