'A', 'B' and 'C' started a business together such that 'A' invested a 50% of the total capital invested by 'A', 'B' and 'C' together, 'B' invested 30% of the remaining capital and 'C' invested the rest, then find the profit share of 'B' given that the business earned a profit of Rs. 1,80,000 at the end of the year.