You sell a stock for $$23\mathrm{.}67$ that was held for $10$ years. You earned a return of $9$

percent per year. What was the original cost of the stock? This is an example of

the present value of a dollar discounted back at $9$ percent per year for $10$ years.

FV $=23\mathrm{.}67$

I $=9$

N $=10$

PMT $=0$

PV $=?$