\({\overrightarrow r _{cm}} = \frac{{0 + 150 \times \left( {\frac{1}{2}i + \frac{{\sqrt 3 }}{2}\hat j} \right) + 100 \times \hat i}}{{300}}\)
\({\overrightarrow r _{cm}} = \frac{7}{{12}}\hat i + \frac{{\sqrt 3 }}{4}\hat j\)
\(\therefore \,\,Co - ordinate\left( {\frac{7}{{12}},\frac{{\sqrt 3 }}{4}} \right)m\)