questions C, D and E need assistance.

c. Find the PV of $1,000 due in 4 years if the discount rate is 8%. Round your answer to the nearest cent. d. A security has a cost of $1,000 and will return $4,000 after 4 years. What rate of return does the security provide? Round your answer to two decimal places. e. Suppose California's population is 36.0 million people, and its population is expected to grow by 4% annually. How long will it take for the population to double? Round your answer to the nearest whole number. years