Kelvin is planning to save for retirement over the 28 years. To achieve this, he will begin saving $450 at the end of each month in a stock account and $270 a month in a bond account. Assume the expected return of the stock account is 9.4% per annum while the bond account is 4.8% per annum. When he retires, Kevin will combine the money into an investment instrument with 5.7% rate of return. Calculate how much can he withdraw each month after he retires, assuming he has a lifespan of 35 years after retire.