The Canadian Government has once again decided to issue a consol (a bond with a never-ending interest payment and no maturity date). The bond will pay $50 in interest each year (at the end of the year), but it will never return the principal. The current discount rate for Canadian government bonds is 6.5%. What should this bond sell for in the market? What if the interest rate should fall to 4.5%? Rise to 8.5%?