$$80,021\mathrm{.}20$ is not correct based on the provided data:

Initial investment: $$274,000$

Revenue starts at $$109,000/$year$,$ grows at $4\%$

Costs start at $$34,000/$year$,$ grow at $5\%$

Depreciation: Straight$-$line over $7$ years

Tax rate: $24\%$

Real discount rate: $7\%$

The discrepancy could come from:

Using a nominal discount rate instead of the real rate

Omitting the depreciation tax shield

Rounding too early in the process

Let me know if you want to recalculate using a nominal discount rate with inflation$-$adjusted values for comparison! $$

$4$o

You said:

yes

ChatGPT said:

Using nominal cash flows and a nominal discount rate $($adjusted for $4\%$ inflation$),$ the recalculated NPV is:

$61,674\mathrm{.}92\backslash$boxed$\{61,674\mathrm{.}92\}61,674\mathrm{.}92$

So$,$ if someone got $$80,021\mathrm{.}20,$ they may have used:

A slightly different inflation assumption

Rounded values mid$-$calculation

Or used a different depreciation treatment