"Karan" and "Arjun" launched a business, with "Karan" contributing 25% more capital than "Arjun." 8 months later, 'Arjun' pulled out of the investment. Determine the profit share of "Arjun" if, at the end of the year, the difference between "Karan's" and "Arjun's" profit shares was Rs. 10,500.