$21.33
The semiannual interest of a TIPS bond is computed on the basis of the inflation-adjusted principal. Because the principal increases with the inflation rate, at the end of the 5-year term, it has grown to $1,219 ($1,000 × 102% ten times). Therefore, the final interest check is for $1,219 × 1.75% (remember it is a semiannual check).