AP ICET 10 Sep 2020 Shift 2 Paper

Note
The 26 letters of English are given ranks 1.2__26.in the alphabetical order. Then for $1\le \mathit{r}\le 26,{\mathit{r}}^{\mathit{t}\mathit{h}}$ letter is coded as ${\mathit{k}}^{\mathit{t}\mathit{h}}$ letter where $7\mathit{r}+3=26\mathit{M}+\mathit{k}\mathrm{where}0\le \mathit{k}\le 25$ and M E Z. When k = 0, ${\mathit{k}}^{\mathit{t}\mathit{h}}$ letter is coded as ‘z’. For example the letter 'E ' is coded as *L’ because when r = 5 and 7r + 3 = 38, then k =12 and ${12}^{\mathit{t}}\mathit{h}$ letter is 'L'. For decoding the reverse process is used. Based on this answer the questions