Four Annual Payments of $20,000 Are Required at the End

Four annual payments of $20,000 are required at the end of each year.Donny's required rate of return is 11% and has a 40% tax rate.The asset is in the 30% CCA class.The half year rule applies and CCA is taken in year 0.After the fourth year, the asset becomes worthless.Determine the NPV of the lease.
$$\begin{array}{l}\begin{array} { | l | r | } \hline \text { DATA: }\\\hline \text { Equipment value } & 70,000 \\\hline \text { Lease payments } & 20,000 \\\hline \text { Number of lease payments } & 4 \\\hline \text { Tax rate } & 40 \% \\\hline \text { CCA rate } & 30 \% \\\hline \text { Rate of interest } & 11.00 \% \\\hline \text { After tax rate of interest } & 6.60 \% \\\hline\end{array}\end{array}$$