Please show me how to do this NOT in excel! Thank you in advance!

Consider an investor initially purchases a 10-year, 8% annual coupon payment bond at a price of $85.503075 per $100 of par value. The bond's yield to maturity (YTM) is 10.40%. 4. Assume the investor holds this bond until maturity. Also assume that the interest rates go down to 9.40% (100 basis points decrease) after the bond is purchased and before the first coupon is received. What is the investor's realized rate of return