Sales of Version 3.0 of a computer software package start out high and decrease exponentially. At time $t$, in years, the sales are $s(t)= 45 e^{-t}$ thousands of dollars per year. After 4 years, Version 4.0 of the software is released and replaces Version 3.0. Assume that all income from software sales is immediately invested in government bonds which pay interest at a 4 percent rate compounded continuously, calculate the total value of sales of Version 3.0 over the four year period.

value = thousand dollars