Solve the following rate of retum problems. a. An investment of $1,200 today returns $66,000 in 50 years. What is the internal rate of return on this investment? b. An investment costs $950,000 today and promises a single payment of $13.1 million in 22 years. What is the promised rate of refuri IRR, on this investment? c. What return do you eam if you pay $22,700 for a stream of $4,000 payments lasting 10 years? Note: Round your answers to 2 decimal places