The following two investment options are viewed under an annual effective interest rate of i.
-Investment A is a 10-year zero coupon bond which redeems at par-value 250.
-Investment B is a perpetuity-immediate paying an annual payment starting with 4 and having each successive payment increase by X% from the previous payment.
If the volatility of each investment is 8, then find the value of X. Give your answer as a percentage rounded to two decimal places.