# Calculus

posted by
**Alex**
.

Sales of Version 5.0 of a computer software package start out high and decrease exponentially. At time t, in years, the sales are s(t)=20e^-t thousands of dollars per year. After 2 years, Version 6.0 of the software is released and replaces Version 5.0. Assume that all income from software sales is immediately invested in government bonds which pay interest at a 7 percent rate compounded continuously, calculate the total value of sales of Version 5.0 over the two year period.

Any ideas??