An investment under consideration has a payback of seven years and a cost of $$870,000.$ Assume the cash flows are conventional. If the required return is $11$ percent, what is the worst$-$case NPV$?($A negative amount should be indicated by a minus sign. Do not round intermediate calculations and round your answer to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

Answer is complete but not entirely correct.

Worst$-$case NPV $ $3,270,444\mathrm{.}91x$