Number name for $900800700$ in Indian System of Numeration is ____.

(i) The number  $825642$ rounded off to nearest thousand is $\mathrm{P}.$
(ii) Estimated product of $4023$ and $198$ is $\mathrm{Q}$.
(iii) $\mathrm{CXXXI}$ is written in Hindu-Arabic numeral as $\mathrm{R}$.