Answer: 11%
Explanation:
The internal rate of return is the rate that will equate the cash inflows with the cost of investment.
It is therefore the discount rate used to find the present value of an annuity because the inflows are stable and are therefore annuities.
Present value of annuity = Annuity * Present value factor of annuity, 12 years, %?
126,594 = 19,500 * Present value of annuity factor
Present value of annuity factor = 126,594 / 19,500
= 6.492
Go to a present value of annuity factor table and find the interest rate that intersects with 12 years to give a factor of 6.492:
Rate is 11%