Four years earlier, Janice purchased a $1,000 face value corporate bond with a 6% annual coupon, and maturing in 10 years. At the time of the purchase, it had an expected yield to maturity of 8.76%. If Janice sold the bond today for $1,088.39, what rate of return would she have earned for the last four years? *Please show step by step without using PVIFA(YTM, n). Thank you.