n=1

An engineer accepts a position with starting salary of $ (n + 40) . 1000 per year. Her salary, S(t) increases exponentially with S(t) = (n + 20)e/20 thousand dollars after t years. Meanwhile, 10% of the salary is deposited continuously in a retirement account, which accumulates interest at a continuous annual rate of 5%. Find A(40), the amount available in the retirement account after 40 years