Calculate the percentage loss (nearest integral value) in the mass, when $2.02 \mathrm{x} {10}^2\mathrm{gm} {\mathrm{KNO}}_3$i completely decomposed by heating into${\mathrm{KNO}}_2\left(\mathrm{s}\right)$ and ${\mathrm{O}}_2\left(\mathrm{g}\right)$. 

${\mathrm{KNO}}_3\left(s\right)⟶{\mathrm{KNO}}_2\left(s\right)+{\mathrm{O}}_2\left(g\right)$