Pricing bonds with spot rates: A four-year default-free annual-pay coupon bond is priced at 100 percent of par. What is its coupon (in percent of par) if annual spot rates are as follows: r1 = 1.86%, r2 = 2.33%, r3 = 2.58%, r4 = 2.53% Carry intermediate calcs. to four decimals. Answer to two decimals.