Aryan, Bhavya, and Chetan initiated a venture with initial investments of Rs. 50,000, Rs. 60,000, and Rs. 72,000 respectively. After six months, Aryan, Bhavya, and Chetan withdrew 80%, 50%, and 75% of their initial investments respectively. After one year, 'r'% of the profit of Rs. 60,000 was given to Aryan for being a working partner, and the rest of the amount was distributed among Aryan, Bhavya, and Chetan in the ratio of their investments. Bhavya invested his profit in an SIP offering 10% p.a. compound interest for 2 years and earned an interest of Rs. 4,158. Determine the value of 'r'.