A, B and C started a business in partnership by investing Rs. 18000. At the end of a year, A, B and C received Rs. 700, Rs. 500 and Rs. 600 respectively as profit share. Calculate the capital invested by A in the business.
Net Profit before interest and tax Rs. 80,000; Equity share capital of Rs. 1,20,000; 10% Preference Share Capital of Rs. 50,000; 12% Debentures Rs. 1,00,000; Reserves and Surplus Rs. 1,30,000; Tax rate 50%; Calculate Return on Investment.