Avinash, Manoj and Arun started a business in partnership investing in the ratio of 3:2:5 respectively. At the end of the year they earned a profit of Rs 45,000 which is 15% of their total investment. How much did Manoj invest?
(a) Rs.60,000 (b) Rs.1,80,00 (c) Rs. 30,000 (d) Rs.90,000 (e) None of these