'R' and 'S' started a business by investing Rs. 12,000 and Rs. 18,000, respectively. 'R' invested for 12 months and 'S' invested for 8 months. 'R' also works as manager in the business for which he's entitled to receive a commission of 30% out of total profit. If at the end of the year, the business earned a total profit of Rs. 30,000, then find the total amount received by 'R'.