b$.$ Use NPV with a Rate argument of $4\mathrm{.}25\%.$

c$.$ Select cells D$7$:D$13$ for the Value$1$ argument and click OK$.$ This is the same as entering each value argument separately.

d$.$ Edit the formula to add both costs $($cells D$4$ and D$5)$ at the end of the formula. The net present value is $$268,921\mathrm{.}79.$