A corporation's pension plan provides a lifetime annual income to its employees upon retirement at age 65. The plan provides 4% for each year of service of the employee's salary upon retirement. Those who retire before 65 have their benefit reduced by 1.2% for each year before 65 that they retire. Russ retires at age 61 with 18 years of service. If his salary upon retirement is $50,564, what is his annual pension benefit?