Problem 7-3 Solve the following rate of return problems. a. An investment of $1,400 today returns $54,000 in 50 years. What is the internal rate of return on this investment? b. An investment costs $800,000 today and promises a single payment of $12.0 million in 22 years. What is the promised rate of return, IRR, on this investment? c. What return do you earn if you pay $23,690 for a stream of $6,000 payments lasting 10 years? Note: Round your answers to 2 decimal places. a. IRR b. IRR c. IRR % % %