A and B are two partners and they have invested Rs. 54,000 and Rs. 90,000 in business. After one year A received Rs 1800 as his share of profit out of total profit of Rs. 3600 including his certain commission on total profit since he is a working partner and rest profit is received by B. what is the commission of A as a percentage of the total profit?

• 20%
• 10%
• 5%
• 25%