Evaluation of Urban Economic Benefit Value Calculation Method Based on Smart City

Table 1

Grade evaluation indicators.

	Very nice	Good	Commonly	Bad	Very bad
BCR	>2	[2, 1)	1	(1, 0.5]	<0.5
IRR	>j	[j, 0)	0	(0, −j]	<−j
NPV	>m	[m, 0)	0	(1, −m]	<−m
Pt	<0.1t	[0.1t, 0.5t)	0.5t	(0.5t, t]	>t