A cutting-edge product of Continental Fan had the following net cash flow series during its first 5-year period on the market. Find all rate of return values between 0% and 100%. (Round the final answer to three decimal places.)
Year Net Cash Flow, $
0 -40,000
1 30,000
2 22,000
3 10,000
4 -2,000
5 6,000
The rate of return is $\boxed{}$ %.