Sales of version 6.0 of a computer software package start out high and decrease exponentially. at time t, in years, the sales are s(t)=50e^t dollars per year. after two years, version 7.0 of the software is released and replaces version 6.0. assuming that all income from software sales is immediately invested in government bonds which pay interest at a 6% rate compounded continuously, calculate the total value of sales of version 6.0 over the two-year period.