A CUHK$($SZ$)$ graduate earns $150$K per year starting from the age of $23,$ growing at $4\%$ per year. The annual expenditure is $100$K in the first year, growing at $2\%$ per year. Suppose all the cash flow occurs at the birthdays, starting at age $23.$ The investment return per year is $7\%.$How much would $($s$)$he have in the bank account at retirement at age $60?$