b
\(\frac{{m{V^2}}}{r} = \frac{{GMm}}{{{r^2}}}\)

\(V = \sqrt {\frac{{GM}}{r}} \)

\(n = \frac{{VT}}{{2\pi r}} = \sqrt {\frac{{GM}}{r}} \frac{T}{{2\pi r}}\)

\( = \left( {\sqrt {\frac{{GM}}{{{r^3}}}} } \right) \times \frac{T}{{2\pi }} = \sqrt {\frac{{6.67 \times {{10}^{ - 11}} \times 8 \times {{10}^{22}}}}{{{{\left( {202 \times {{10}^4}} \right)}^3}}}}  \times \frac{T}{{2\pi }}\)

\( = \frac{{24 \times 3600}}{{2 \times 3.14}}\sqrt {\frac{{6.67 \times 8 \times {{10}^{11}}}}{{{{\left( {202} \right)}^3} \times {{10}^{12}}}}} \)

\( = \frac{{24 \times 3600}}{{2 \times 3.14 \times 1242.8}} = \frac{{24 \times 3600}}{{78.51}} \simeq 11\)