Present value of a perpetuity

What is the present value of a $300 perpetuity if the interest rate is 9%? Round your answer to the nearest cent.

$

If interest rates doubled to 18%, what would its present value be? Round your answer to the nearest cent.

$

Effective interest rate

You borrow $265,000; the annual loan payments are $17,238.63 for 30 years. What interest rate are you being charged? Round your answer to two decimal places.