What is the discount rate at which the following cash flows have a NPV of $0? Answer in %, rounding to 2 decimals. Year 0 cash flow = -145,000 Year 1 cash flow = 35,000 Year 2 cash flow = 42,000 Year 3 cash flow = 43,000 Year 4 cash flow = 30,000 Year 5 cash flow = 41,000 Year 6 cash flow = 42,000