A private equity (PE) firm invested equity of $50 million in ABC Corp. for a 100% ownership interest. Four years later it sold ABC for 10X EBITDA. At the time of exit EBITDA was $30 million and net debt (debt less cash on hand) was $145 million. What was the PE firms annual rate of return on the investment (your answer should be in the following format xx.x%) 50.896