The following are exercises on internal rates of return:

a. An investment of $10,000 today will return $5,000 at the end of 10 years. What is its internal rate of return?

b. An investment of $10,000 will return $5000 at the end of each of the next 3 years. What is its internal rate of return?

c. An investment of $10,000 today will return $8000 at the end of 1 year, $6000 at the end of 2 years, and $1000 at the end of 3 years. What is its internal rate of return