A, B and C started a business with their capitals in the ratio \(\frac{1}{5}\) : \(\frac{1}{2}\) : \(\frac{7}{10}\) . After 4 months, A increased his capital by 50% and C decreased his capital by 20%. At the end of a year, B received Rs. 90,000 as a share in the profit, the share of C in the profit is: