TeX source:

R C A_{k}^{i}=\left(\frac{D V A_{k}^{i}}{\sum_{k=1}^{N} D V A_{k}^{i}}\right) /\left(\frac{\sum_{i=1}^{G} D V A_{k}^{i}}{\sum_{k=1}^{N} \sum_{i=1}^{G} D V A_{k}^{i}}\right)